• Fulvic Acid Powder — 120g kraft pouch with dr forest Organic Fulvic Acid Powder, 70% Fulvic Acid & 99% Soluble label
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Dr Forest

Fulvic Acid Powder | 70% Fulvic | Plant Biostimulant

Fulvic Acid Powder | 70% Fulvic | Plant Biostimulant

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What is fulvic acid? Premium 70% fulvic acid powder, 99% soluble, for plants

70% Fulvic Acid 99% Water Soluble Enzymatic Process For Plants & Soil OF&G Approved Natural Chelator
Garden use only — not a human supplement

This is an organic plant biostimulant for use in the garden, allotment and protected growing setting. It is not a dietary supplement and is not formulated, tested or approved for human consumption. If you're looking for a fulvic acid supplement to take orally, this is not the product — those go through completely different food-grade processing, heavy-metal testing and human-use certification.

Fulvic acid is the smallest, most water-soluble fraction of humic substances — the carbon-rich molecules left behind when plant material has been broken down by microbes over geological timescales. The molecules are small enough (1,000 to 10,000 daltons) to pass through plant cell walls intact, which is why fulvic acid for plants works inside the leaf and root rather than only in the soil. As a biostimulant it chelates trace minerals into mobile, plant-available complexes, activates the H⁺-ATPase pump on root cell membranes, and triggers lateral root formation through auxin-like signalling. Most growers use fulvic and humic acid together — fulvic for the fast plant-side response, humic flakes for the slower soil-side build.

This powder is produced by enzymatic hydrolysis — biological enzymes at ambient temperature, gentler than the alkaline extraction used in cheaper products and preserving the heat-sensitive bioactive compounds that high-temperature processes destroy. 70% fulvic acid by mass, 99% soluble in cold water: it dissolves in seconds with no sediment, no insoluble fraction, and nothing to clog drip emitters or fine spray nozzles. Approved for organic production by OF&G (Organic Farmers & Growers). Handcrafted in Stockport.

70%Fulvic Content
99%Water Soluble
<10k DaMolecular Weight
0.8 g/LFoliar Rate, Tomato

What fulvic acid does for plants

  • Chelates trace minerals. Iron, zinc, manganese, copper and boron all move more readily when bound to fulvic acid. Most useful on chalky and high-pH soils where these elements precipitate quickly.
  • Unlocks bound phosphorus. Fulvic acid binds calcium and iron preferentially, freeing the phosphate they were holding. A practical fix for the lock-up that costs you yield on alkaline gardens.
  • Reduces blossom-end rot in tomatoes. Keeps calcium mobile during fruit set so transpiration carries more of it through to the fruit (Suh et al. 2014, eliminated at 1.6 g/L).
  • Drives lateral root growth. Mimics auxin at low concentrations, induces lateral root formation through the same IAA19 gene pathway as the hormone itself (Trevisan et al. 2010).
  • Primes drought tolerance. Pre-treated plants produce more SOD, POD, CAT and APX, the enzymes that clear reactive oxygen species when stress arrives (Zhu et al. 2024 on oat; Sun et al. 2020 on tea).
  • Increases yield in fruiting vegetables. 35% yield rise on greenhouse tomato at 2.7 g/kg base dressing, with higher fruit calcium, iron and zinc (Zhang et al. 2021).
  • Lifts flower number on roses and ornamentals. 19.8% more flowers per plant and 52.8% higher flower yield per hectare on Damask rose at 3 g/L foliar (Ali et al. 2022).
  • Improves nitrogen use efficiency. 27% NUE improvement and 17% increase in nitrogen uptake across pooled humic-acid trials in 28 countries (Ma et al. 2024 meta-analysis).
  • Passes through fine irrigation. 99% solubility means no residue, no blockages, and no filtration step before drip emitters or precision spray nozzles.

Humic and fulvic acid: how they differ and why you want both

Fulvic acid powder — fast-acting, works in the plant

  • Molecular weight 1,000–10,000 Da — small enough to cross cell walls
  • Soluble at any pH; fully dissolved at working rates with no insoluble fraction
  • Acts as chelator and biostimulant inside leaf and root
  • Foliar sprays, soil drenches, seed soaks, fertigation
  • Visible response within 2–4 weeks of consistent use
  • Best mixed with the rest of your feeding programme — fulvic is a carrier, not a feed

Humic acid flakes — biological response builds over months

  • Molecular weight 10,000–100,000 Da — too large for cell walls
  • Insoluble below pH 2; dark brown to black solution
  • Lifts cation-exchange capacity, feeds soil microbes, structures aggregate
  • Best as a base dressing or monthly soil drench
  • Effects build over months and seasons rather than days
  • Not effective as foliar — molecule is too big to penetrate the leaf cuticle

What sets a quality fulvic acid apart

Enzymatic hydrolysis (this product)

  • Biological enzymes break down source material at ambient temperature
  • Preserves heat-sensitive bioactive compounds — phenolics, amino-acid complexes, enzymatic cofactors
  • More expensive and slower to produce, but more bioactive in published trials
  • 70% fulvic content and 99% solubility, both declared on the label and verifiable on test
  • Approved for organic production by OF&G

What to be wary of in cheaper imports

  • Alkaline extraction in potassium or sodium hydroxide at high temperature destroys heat-sensitive bioactives and introduces process-derived potassium
  • Lignosulphonate sold as fulvic acid is a paper-mill by-product from sulphite pulping — yellow-brown and water-soluble, but not the fulvic fraction of soil organic matter
  • A 2025 AOAC International survey of 25 commercial fulvic products found only 14 contained genuine fulvic on UV testing
  • Vague label descriptors with no certificate of analysis are a red flag — ISO 19822 and AOAC 2024.07 (LAMAR) are the recognised test methods

The science of fulvic acid: chelation chemistry, the humic and fulvic acid family, hormesis, and the meta-analysis numbers

Fulvic acid biostimulants are classed under EU regulation as substances that stimulate plant nutrition processes regardless of nutrient content, and the most useful synthesis of the evidence is the 2024 Agronomy meta-analysis by Ma and colleagues: 12% average yield increase on humic-acid amendments across 28 countries, 27% improvement in nitrogen use efficiency, and 17% increase in nitrogen uptake. Effects are biggest on soils with moderate pH and low-to-moderate organic matter — exactly the gardens where fulvic acid is most worth using.

Mechanistically, fulvic acid does three things. It carries an unusually high density of carboxyl (–COOH) and hydroxyl (–OH) groups for its size — these bind tightly to positively charged metal ions (iron, manganese, zinc, copper, calcium, magnesium) and form small chelated complexes that move freely through soil water and across plant cell membranes. Inside the plant, low-molecular-weight fragments interact with auxin signalling and trigger lateral root formation. Third — less obvious until you see the dose-response data — moderate concentrations of fulvic and humic acid prime the plant's antioxidant defences, stretching tolerance to drought and salinity. Too much suppresses the same response.

Six mechanisms with the trial data behind each

01

Chelation of trace minerals

Carboxyl and hydroxyl groups bind metal cations to form small soluble complexes. The complex stays mobile in soil solution across a wide pH range, reaches root surfaces, and crosses cell membranes intact. The same mechanism also lets fulvic acid bias uptake away from sodium and chloride on saline soils — barley grain yield rose 64.7% over the salt-stressed control on saline land in Egypt, with reduced phosphorus rates and no yield loss.

Alsudays et al. 2024, BMC Plant Biology 24: 191
02

H⁺-ATPase activation in roots

The plasma membrane H⁺-ATPase is the proton pump that drives nutrient uptake by acidifying the root surface. Humic substances isolated from earthworm compost activated this pump in maize roots at very low concentrations (4 mg carbon per litre), enhancing root elongation and lateral root emergence. The finding has replicated across maize, Arabidopsis and rice.

Canellas et al. 2002, Plant Physiology 130(4): 1951–1957
03

Auxin-mimetic lateral root induction

Trevisan and colleagues showed in 2010 that humic substances induce lateral root formation in Arabidopsis through the same gene-expression signature — the IAA19 gene and the DR5 auxin-response element — as a low dose of auxin itself. The flush of lateral roots and longer root hairs is what most growers notice first: a denser, fuzzier root ball within two to four weeks of starting to use fulvic acid.

Trevisan et al. 2010, Plant, Cell & Environment 33(1): 145–156
04

Antioxidant priming for drought tolerance

Drought stress floods cells with reactive oxygen species. Plants pre-treated with fulvic acid carry higher activity of superoxide dismutase, peroxidase, catalase and ascorbate peroxidase, and lower accumulation of malondialdehyde (the cell-membrane damage marker). Drought-stressed oat retained higher relative water content and chlorophyll under the same stress as the untreated controls. The treatment has to go on before the stress arrives, not after.

Zhu et al. 2024, Frontiers in Plant Science 15: 1439747
05

Calcium delivery to fruit, blossom-end rot

Foliar fulvic acid at 0.8 g/L on greenhouse tomatoes increased plant height, fresh and dry weight and marketable yield through more medium and large fruit. Blossom-end rot was greatly reduced at all rates and eliminated entirely at 1.6 g/L. Cracking was also reduced. The mechanism is the same as for the trace minerals: keep calcium mobile and chelated, more of it gets to the fruit on the transpiration stream.

Suh, Yoo & Suh 2014, Hort. Environ. Biotechnol. 55(6): 455–461
06

Phenolic and antioxidant content in produce

The flavour, colour and nutritional quality of fruit comes from secondary metabolites: phenolic acids, flavonoids, carotenoids. Foliar fulvic at 1.5 g/L on mature pistachio at kernel formation raised phenolic compounds in the harvested kernel by 31.8% and flavonoid content by 24.5%. Catalase, ascorbate peroxidase and SOD activity all rose substantially. The same direction of effect shows up across the fruit and ornamental literature.

Nikoogoftar-Sedghi et al. 2024, BMC Plant Biology 24: 241

The dose-response curve is non-linear

Fulvic acid does not behave like a fertiliser. With nitrogen fertiliser, more gives more leaves up to the salt-damage point. With fulvic acid, the effective dose window is narrow, and going past it actively suppresses the response. The Suh tomato trial shows it cleanly: 0.8 g/L produced larger plants and more fruit; 1.6 g/L produced smaller plants and smaller fruit. Same season, same cultivar. Rice seedlings: 0.05 g/L stimulated root growth, 0.5 g/L inhibited it. Pistachio: 1.5 g/L was the optimum for phenolic content; 4.5 g/L gave smaller gains. Researchers call this hormesis. The practical rule for fulvic acid dosage is to start at the low end of the published range and only step up if a few cycles of consistent application aren't producing visible results.

A modest amount stimulates. Too much inhibits. The relationship is a curve, not a straight line.

References

  1. Ma, Y. et al. (2024). Meta-analysis of humic-acid amendments on crop yield and nitrogen use efficiency. Agronomy 14(12): 2763.
  2. Suh, H.Y., Yoo, K.S., Suh, S.G. (2014). Effect of foliar application of fulvic acid on plant growth and fruit quality of tomato. Hort. Environ. Biotechnol. 55(6): 455–461.
  3. Zhang, P. et al. (2021). Dose-dependent application of straw-derived fulvic acid on yield and quality of tomato plants. Frontiers in Plant Science 12: 736613.
  4. Ali, E.F. et al. (2022). Ginger extract and fulvic acid foliar applications on damask rose. Plants 11(3): 412.
  5. Nikoogoftar-Sedghi, M. et al. (2024). Fulvic acid foliar application on pistachio. BMC Plant Biology 24: 241.
  6. Zhu, S. et al. (2024). Fulvic acid alleviating drought stress in oat. Frontiers in Plant Science 15: 1439747.
  7. Sun, J. et al. (2020). Fulvic acid in tea plants under drought stress. BMC Genomics 21(1): 411.
  8. Canellas, L.P. et al. (2002). Humic acids isolated from earthworm compost enhance root elongation and plasma membrane H⁺-ATPase activity in maize. Plant Physiology 130(4): 1951–1957.
  9. Trevisan, S. et al. (2010). Humic substances induce lateral root formation in Arabidopsis through auxin-responsive pathways. Plant, Cell & Environment 33(1): 145–156.
  10. Alsudays, I.M. et al. (2024). Potassium humate and fulvic acid on saline-soil barley with reduced phosphorus. BMC Plant Biology 24: 191.
  11. Schmidt, R.E., Zhang, X. (1999). Antioxidant response to humic substance in Kentucky bluegrass under drought. Crop Science 39: 545–551.

How to apply fulvic acid in the UK garden: rates by crop, with the published trial behind each one

Use rainwater where you can

Hard UK tap water carries calcium and magnesium that bind to fulvic acid before it reaches the leaf, lowering the bioactivity you paid for. Rainwater is the cleanest carrier for any fulvic acid spray. If you only have hard tap water, leave it standing 24 hours to let chlorine outgas, or pre-acidify slightly with a few drops of dilute citric acid. Mix fresh, use within 24 hours — diluted fulvic acid is a substrate for bacteria and a sprayer left for two weeks turns cloudy.

Mixing

  1. Measure on a digital scale. Rates are in grams per litre. A level teaspoon of this powder is roughly 2.5 g, but the dose-response curve is narrow enough that scale weighing pays off. A quarter teaspoon is approximately 0.6 g; half a teaspoon roughly 1.2 g.
  2. Pre-dissolve in a small amount of warm water. 1 g in 30 ml, shaken in a jar for 30–60 seconds, dissolves fully — the 99% solubility means there should be no visible particles or grit at the bottom. Do not add powder direct to a full sprayer.
  3. Add the concentrate to the rest of the volume. Pour the dissolved fulvic into the watering can, spray tank or reservoir and stir briefly. At 1 g/L the working solution is fully dissolved with no settling.
  4. Add the rest of the feed last. Fulvic is the carrier — add other feeds, seaweed extract or trace mineral sprays after the fulvic is in solution. Avoid mixing with strongly alkaline products such as some lime washes or high-pH potassium silicate, which can precipitate the chelated complexes.
  5. Apply within 24 hours. The diluted solution doesn't keep. The dry powder, sealed, is stable for years.
Hard rule on dose

The dose-response curve is non-linear and going past the optimum reverses the effect. 0.8 g/L beats 1.6 g/L on tomatoes. Start at the low end of each range below. Step up only if a few applications haven't produced visible results — and then look at water quality, application timing and soil condition before assuming the dose was the problem.

Foliar spray rates

Tomato, pepper, aubergine

Rate: 0.8 g/L | Frequency: Every 2–3 weeks from transplant through to fruit set

The most-cited foliar rate in the literature. Greenhouse trials at 0.8 g/L produced larger plants, more medium and large fruit, and reduced blossom-end rot at every test rate. Spray early morning or late evening on both leaf surfaces.

Suh, Yoo & Suh 2014

Lettuce, brassicas, salad leaves

Rate: 0.5–1 g/L | Frequency: Every 3–4 weeks during active growth

Lower foliar rates work best on leafy crops. The aim is steady supply rather than push.

Plant Sci Today 2025 review of 100+ studies

Strawberry, soft fruit

Rate: 1–2 g/L | Frequency: Pre-flower and at green-fruit stage

Two well-timed sprays carry more weight than monthly maintenance through the flowering window.

Roses and ornamentals

Rate: 1–3 g/L | Frequency: April pre-flower, then monthly through summer

Damask rose at 3 g/L lifted flower number per plant by 19.8% and flower yield per hectare by 52.8%. Garden roses are less responsive than the cut-flower cultivars in the trial, but the direction of effect is consistent.

Ali et al. 2022

Apple and tree fruit

Rate: 1.5–3 g/L | Frequency: Bud-break, fruit-set, mid-summer

Pistachio trials show 1.5 g/L is the optimum for phenolic and antioxidant content in the kernel. Higher rates flatten or reverse the response.

Nikoogoftar-Sedghi et al. 2024

Lawn / turfgrass (drought priming)

Rate: 0.5–1 g/L | Frequency: Spring pre-stress, then monthly through summer

The benefit on turf shows up under stress, not on a healthy lawn already getting enough food and water. Apply 3 to 4 weeks before expected drought (May onwards in southern England, June in the north).

Schmidt & Zhang 1999

Soil drench rates

Pots and containers (15–25 cm)

Rate: 1 g/L | Volume: 250–500 ml per pot | Frequency: Every 3–4 weeks

Apply to moist (not dry) soil at the root zone. Pre-water if needed so the drench doesn't channel straight through.

30 cm+ pots and grow bags

Rate: 1–2 g/L | Volume: 500–1,000 ml | Frequency: Every 3–4 weeks

Wet the rooting zone but don't soak straight through. For a 30 cm pot, half a litre of working solution is about right.

Open-ground vegetable beds

Rate: 1 g/L | Volume: 5 litres per m² | Frequency: At planting, then every 4 weeks

Roughly 5 g of powder per square metre per drench cycle. The field-scale benchmark from the saline-alkali processing tomato trial is 50 kg/ha, which peaked at 50 and declined at 75 (the dose-response curve again). The back-garden equivalent is 5 g/m². Use 1 g/L in solution rather than spreading powder dry — the chelation effect needs the fulvic in solution.

Irrigation Science 2025

New tree or shrub at planting

Rate: 2 g/L | Volume: 5–10 litres at the base | Frequency: Once at planting

Auxin-like stimulation of lateral roots begins within 48–72 hours. Significantly reduces transplant shock and accelerates establishment.

Established perennial border

Rate: 2 g/L | Volume: 2 litres per plant | Frequency: Spring and after flowering

Most useful on chalky beds where iron, zinc and phosphorus lock-up are recurrent issues.

Seed soak rates

Seed pre-soak before sowing

Rate: 1–3 g/L | Time: 4–6 hours (no longer than 12)

Tomato seeds soaked in fulvic acid at 0.08–0.16 g/L showed higher germination, longer radicles and greater seedling biomass than water-soaked controls. For garden use the practical rate is higher: 1 g/L, 4 hours for fine seeds (lettuce, brassicas, herbs); 1–2 g/L, 4–6 hours for medium seeds (tomato, pepper, beetroot); 2–3 g/L, 6–8 hours for large seeds (peas, beans, cucurbits); 2 g/L overnight for hard-coated slow-germinating seeds (carrot, parsnip, parsley). Don't soak past 12 hours — seeds need oxygen to germinate.

Zhang et al. 2021

Drip irrigation / fertigation

Rate: 1–2 g/L | Frequency: Every 2–4 weeks

99% solubility means no residue, no blockages, no filtration step. Add the pre-dissolved concentrate to the reservoir after the main nutrient solution is mixed.

Five common mistakes

What ruins a sound protocol

Spraying onto hot leaves at midday. The spray dries before the cuticle absorbs it. Worst case, dilute solution concentrates as it dries and leaves droplet burn marks. Apply early morning or late evening.

Mixing in hard tap water without adjusting. Calcium and magnesium in hard UK water lock up part of the fulvic before it reaches the leaf. Use rainwater, or stand tap water 24 hours and pre-acidify with a few drops of dilute citric acid.

Storing diluted solution. Diluted fulvic supports bacterial growth. Mix what you need, use it within 24 hours, pour the rest on the soil.

Treating it as a rescue product. Fulvic is a priming and uptake input. A wilting drought-stressed plant won't recover faster from a fulvic spray. The plant that won't wilt at all is the one that was sprayed three weeks earlier.

Using it on a well-fed plant in isolation. Fulvic is the carrier. If there are no nutrients in the soil for it to chelate, the chelation does nothing. Use it alongside an organic fertiliser, a compost-fed soil, or a regular liquid feed.

Pairs well with

Fulvic acid is a carrier, not a feed — it works hardest alongside the rest of the programme. Pair with our Humic Acid Flakes as a monthly soil drench for the slower soil-side benefit; together the fulvic humic acid pairing is the most studied combination in the literature. Add the powder to any micronutrient feed where iron, zinc or manganese absorption is limiting. Tank-mix with our Liquid Seaweed for complementary biostimulant mechanisms. For long-term reading, our blog covers what fulvic acid is and eight peer-reviewed benefits in more detail.

Frequently asked questions about fulvic acid powder

No. This is a garden biostimulant for plants and soil — not a dietary supplement and not approved for human consumption. It hasn't been processed, tested or certified for human use, including the heavy-metal and microbial testing that food-grade products go through. If you want fulvic acid as a mineral supplement to take orally, look for a product specifically formulated and certified for human consumption (those will declare GMP manufacturing, food-grade processing and full heavy-metal testing on the certificate of analysis). Our fulvic acid powder is for plant and soil use only.
Fulvic acid is the smallest, most water-soluble fraction of humic substances — the carbon-rich molecules left behind when plant material has been broken down by microbes over geological timescales. The molecules are typically 1,000 to 10,000 daltons across, small enough to pass through plant cell walls, which is why fulvic acid works inside the plant rather than only in the soil. It chelates trace minerals into mobile, plant-available complexes, activates the H⁺-ATPase pump on root cell membranes, and triggers lateral root formation through auxin-like signalling. Used as a foliar spray, soil drench, seed soak, or addition to fertigation programmes.
For most garden uses, 0.5 to 1 g per litre as a foliar spray or 1 to 2 g per litre as a soil drench. The most-cited tomato research (Suh et al. 2014) used 0.8 g/L foliar at 10, 20 and 30 days after transplant. For ornamentals and roses the published range is 1 to 3 g/L. Don't exceed 2 g/L on edibles without specific evidence for that crop. Seed soaking is 1 to 3 g/L for 4 to 6 hours before sowing.
Yes, and this is the most common mistake. The dose-response curve is non-linear. The Suh tomato trial showed 0.8 g/L significantly increased fruit yield and plant size, while 1.6 g/L (double the rate) produced smaller plants and smaller fruit. Rice seedling work shows the same pattern at lower concentrations: 0.05 g/L stimulates root growth, 0.5 g/L inhibits it. Researchers call this hormesis. Stick to published rates, start at the low end, and only step up if a few applications haven't produced visible results.
Method and specs. This powder is produced by enzymatic hydrolysis — biological enzymes at ambient temperature — rather than alkaline extraction in hot potassium or sodium hydroxide, which destroys many heat-sensitive bioactive compounds and introduces process-derived potassium. The specs are also declared and verifiable: 70% fulvic acid by mass, 99% soluble in cold water, OF&G organic approved. Cheap "fulvic acid" imports are often lignosulphonate (paper-mill by-products) sold under the same name. A 2025 AOAC International survey of 25 commercial fulvic products found only 14 contained genuine fulvic acid on UV testing. Always look for declared specs and a certificate of analysis (ISO 19822 or AOAC 2024.07 LAMAR are the recognised test methods).
The two are the same chemical family. They do different jobs because of their different sizes. Fulvic molecules are 1,000 to 10,000 daltons across, small enough to cross plant cell walls and work inside the plant. Humic molecules are ten times larger, can't cross cell walls, and work in the soil — building cation-exchange capacity, structuring aggregate, feeding microbes. The shorthand most growers use: humic acid mostly improves the soil, fulvic acid mostly improves the plant. They work best together. A monthly humic flake drench plus fulvic added to your foliar feeds is a typical UK garden setup.
Hard UK tap water carries calcium and magnesium ions that bind to fulvic acid before it reaches the plant. The chelation effect you paid for gets used up on the calcium in your tap water. Rainwater is best. If only tap water is available, stand it for 24 hours to let chlorine outgas, then pre-acidify slightly with a few drops of dilute citric acid solution. The same logic applies to most liquid feeds you'd tank-mix with the fulvic.
Root effects (denser, fuzzier root mass) usually appear within 2 to 4 weeks of consistent application. Drought-tolerance priming needs 3 to 4 weeks before the stress event to take effect; treatment after the plant is already wilting won't help. Yield and quality effects on fruit and flowers appear over a full growing season, since they depend on cumulative nutrient uptake and stress avoidance through the cycle. Don't expect dramatic week-one transformations on a plant that is already well-fed.
Yes, and the published trials repeatedly show combined applications outperform either input alone. Fulvic tank-mixes well with most liquid organic feeds, seaweed extracts, amino-acid biostimulants and trace mineral sprays — it's the carrier that makes the rest work harder. Avoid mixing with strongly alkaline products such as some lime washes or high-pH potassium silicate, which can precipitate the chelated complexes. Add the fulvic to water first, dissolve fully, then add the rest of the feed.
Yes for all those — when used as a garden input. Fulvic acid is a naturally occurring organic compound found in fertile soils. Non-toxic to mammals, birds, bees and soil organisms at any realistic application rate. Approved for organic production by OF&G (Organic Farmers & Growers). No withholding period for the edible crops you've sprayed or drenched — once the application has dried in or been absorbed, the garden is safe for children, pets and wildlife as normal. Note that this is a garden product, not a dietary supplement — see the supplement question above.
Sealed, in a cool dry place out of sunlight. The powder is hygroscopic — it absorbs moisture from the air — and clumps if exposed to humidity. Clumping doesn't affect efficacy but makes weighing harder. Reseal after each use. Dry powder kept this way is stable for years. We've used powder from sealed bags 3 to 4 years old with no measurable loss of bioactivity. Working solution, on the other hand, supports microbial growth once diluted — mix what you need and use within 24 hours.
Handcrafted in Stockport, Greater Manchester. The powder is produced by enzymatic hydrolysis to 70% fulvic acid by mass and 99% solubility in cold water, supplied in compostable packaging. As an organic fulvic acid powder it carries OF&G (Organic Farmers & Growers) approval — the standard the UK organic trade uses for input certification — so this is among the few fulvic acid UK growers can use under organic certification. Our liquid fulvic acid (a separate product) is Soil Association approved.
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