Free Shilajit Tool
Fulvic Acid Percentage Calculator
A jar that claims 80% fulvic acid is making a claim that published analyses of real shilajit rarely support. Enter what your label says and this tool works out the actual fulvic acid in milligrams per serving, then tells you whether that percentage is believable for the type of product you bought.
- Runs in your browser, nothing is stored
- Checks the claim against ISO 19822
- Last updated: September 2026
What you are actually getting
Fulvic acid per serving
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Fulvic acid per day
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Enter your label details
Fill in the fields above and this will tell you whether the percentage is realistic.
This tool works from the numbers you type in. It cannot test your product. Treat the result as a way to question a label, not as a laboratory finding. Shilajit is a supplement, not a medicine. Speak to a doctor or pharmacist before taking it, especially if you take prescription medication.
Comparing two jars by price alone tells you very little. Enter up to three products and this ranks them by the fulvic acid each one actually delivers per serving.
Ranked by fulvic acid per serving
| Product | Serving | Claimed | Fulvic acid per serving | Is the claim realistic |
|---|
Ranking uses the percentage each brand claims. If one of those claims is unrealistic, the ranking flatters that product. Read the realism column before trusting the order.
Why the percentage on the jar misleads people
Fulvic acid has become the headline number in shilajit marketing. Brands compete on it, so the figures keep climbing. You will see 60%, 76%, even 85% printed on jars of resin.
There are two separate problems buried in that number, and most shoppers only notice the first one.
The first problem is arithmetic. A percentage means nothing without a serving size. A capsule at 50% fulvic acid and 250 mg gives you 125 mg. A resin dose at 20% and 500 mg gives you 100 mg. The lower percentage is not automatically the weaker product. That is what the calculator above fixes in one step.
The second problem is measurement. There is no single agreed way to measure fulvic acid unless the brand names the method. Some tests measure a specific, physically separated fulvic fraction. Others measure total organic carbon, or colour, and call the answer fulvic acid. Those tests can return numbers that are far higher for the very same jar.
The short version
A percentage without a serving size is meaningless, and a percentage without a named test method is unverifiable. You need all three numbers before a fulvic acid claim tells you anything at all.
How this calculator works
The core maths is deliberately simple, because the hard part is not the arithmetic.
Fulvic acid per serving = serving size in mg x claimed percentageFulvic acid per day = fulvic acid per serving x servings per dayThe calculator then does two things a plain formula cannot. It checks the percentage against the range published analyses report for that type of product, since a standardised extract and a lump of raw resin are not judged by the same yardstick. And it checks whether the test method behind the number can be compared with ISO 19822, the international standard.
Where a method is not comparable, the tool says so rather than inventing a corrected figure. There is no published conversion factor between colorimetric results and ISO 19822 results, so pretending otherwise would be guesswork dressed up as precision.
What fulvic acid actually is
Fulvic acid is not one molecule. It is a family of small organic compounds formed as plant material breaks down over a very long time. In shilajit it sits alongside minerals, dibenzo-alpha-pyrones and other organic matter.
Because it is a family rather than a single compound, measuring it means separating a defined fraction and weighing it. This is exactly why the method matters so much, and why two honest labs using two different methods can both be telling the truth while reporting very different numbers.
Fulvic acid is genuinely interesting to researchers, and early work has looked at its effects on inflammation and gut health. That research is still limited and mostly preliminary. It does not establish that a higher percentage in your jar produces a better result in your body.
The testing method problem
This is the part almost no shilajit page explains, and it is the reason two jars can both claim to be lab tested while meaning completely different things.
| Method | What it actually measures | Effect on the number | Comparable to ISO 19822 |
|---|---|---|---|
| ISO 19822:2018 | A defined hydrophobic fulvic fraction, physically separated then weighed | The reference point | Yes, it is the standard |
| Lamar method | The separation method ISO 19822 is built on | Equivalent in principle | Yes |
| TOC | All organic carbon present, whatever supplied it | Can read roughly 20 to 50% higher | No |
| Colorimetric | Colour intensity after extraction | Tends to overstate, cannot separate fulvic from humic | No |
| UV-Vis | Light absorption, affected by anything else that absorbs | Depends heavily on calibration | No |
| Titration | Reactive chemical groups, estimated indirectly | Depends on the chemical model assumed | No |
ISO 19822:2018 was published after the Lamar method was validated and accepted through the Journal of AOAC International. It works by alkaline extraction, acidification, separation of the hydrophobic fulvic fraction on a resin column, then gravimetric measurement of what is left after drying. It is slow and it is not cheap, which is part of why many brands do not use it.
A certificate that says only “fulvic acid: 76%” with a laboratory logo and no method name is not proof of anything. The method is the claim. Without it, the number cannot be checked or compared with any other product.
What percentages are actually realistic
Two different yardsticks apply here, and conflating them is how a lot of confusion starts.
Raw resin, traditional powder and liquid
Published analyses of natural shilajit generally report fulvic acid in the single digits up to around 20%. Nothing in the material is concentrated, so there is a ceiling on what it can contain. A resin label claiming 60% or more is claiming something the source material does not usually supply. The usual explanations are a non-specific test method, a low-altitude organic concentrate sold as shilajit, or added fulvic acid.
Standardised extracts
Extracts are a different case entirely. Manufacturing concentrates the fraction of interest, so a figure around 50% can be perfectly legitimate for a standardised extract used in capsules. The well-known branded ingredients in this category are standardised in roughly that region.
So the same 50% is unremarkable on a capsule and a red flag on a jar of raw resin. The calculator applies the right yardstick once you tell it which type you have.
Why a higher percentage is not automatically better
This is worth stating plainly, because the whole market is pushing in the opposite direction.
Shilajit is not a fulvic acid delivery vehicle. The material also carries dibenzo-alpha-pyrones, trace minerals and other organic compounds, and the research on shilajit was done on shilajit, not on isolated fulvic acid. Pushing the fulvic number as high as possible means processing the material harder, and at some point what you are holding is a fulvic acid concentrate rather than shilajit.
There is also no evidence that higher fulvic percentages produce proportionally better outcomes in people. The human trials on shilajit used specific doses of purified material, not products selected for the highest fulvic percentage on the shelf. You can see how a dose compares with those trials using our shilajit dose converter.
A more useful question
Instead of asking which jar has the highest percentage, ask which brand will tell you the test method, the laboratory, and the heavy metal results. A brand that answers all three is telling you more than any number on the front of the jar.
How to ask a brand for proof
Most people never ask, and brands know it. A short, specific email gets a much better response than a vague one, because it shows you know what a real answer looks like. Here is one you can send as it is.
Hello,I am considering buying your shilajit and I have two questions about testing.1. What method was used to measure the fulvic acid percentage on your label? I am looking for the method name, for example ISO 19822, the Lamar method, TOC or colorimetric.2. Could you send the third-party certificate of analysis, including the name of the laboratory and the heavy metal results for lead, arsenic, mercury and cadmium?Thank you.
What the replies tend to mean, in practice:
- They name the method and send the certificate. This is the answer you want, whatever the percentage turns out to be.
- They send a certificate with no method named. Ask once more, specifically. The laboratory will have recorded it.
- They reply with marketing copy about purity. That is not an answer to either question.
- They do not reply. Treat the percentage on the jar as unverified.
Label red flags worth knowing
- A fulvic percentage above 25% on raw resin. Possible in principle, but it needs a named method and a certificate before it means anything.
- Fulvic and humic percentages added together. Some labels quote a combined figure that looks like a fulvic number. They are different fractions.
- “Lab tested” with no laboratory named. An unnamed lab cannot be checked.
- A percentage but no serving size. You cannot work out your actual intake, which is the only figure that affects you.
- No heavy metal results at all. For a mineral-rich substance collected from rock, this is the test that matters most for safety.
- Percentages that change between the jar, the website and the listing. One of them is wrong, and it is fair to ask which.
Our guide on how to identify fake shilajit covers the physical tests you can do at home once the paperwork checks out.
Frequently asked questions
Is 80% fulvic acid in shilajit possible?
For raw resin it is very unlikely. Published analyses of natural shilajit generally report figures in the single digits up to around 20%. A number that high usually points to a non-specific test method, a concentrate that is not really shilajit, or added fulvic acid. For a heavily processed standardised extract a high figure is more plausible, but it should still come with a named method and a certificate.
How much fulvic acid is in a 500 mg serving?
Multiply the serving by the percentage. At a claimed 20%, a 500 mg serving contains 100 mg of fulvic acid. At a claimed 50% it contains 250 mg. The calculator at the top of this page does this for your own label and then tells you whether the percentage is believable for that type of product.
What is ISO 19822 and why does it matter?
ISO 19822:2018 is the international standard method for measuring humic and fulvic acids. It physically separates a defined fulvic fraction and weighs it, rather than estimating it from colour or total carbon. It matters because results from other methods are not directly comparable, so two products tested differently cannot be ranked against each other.
Does a higher fulvic acid percentage mean better shilajit?
Not necessarily. Shilajit also contains dibenzo-alpha-pyrones, minerals and other organic compounds, and the human research was conducted on shilajit rather than on isolated fulvic acid. Beyond a point, pushing the fulvic percentage up means processing the material until it is closer to a fulvic concentrate than to shilajit.
Can I test fulvic acid content at home?
No. The home tests circulating online, such as dissolving resin in water or applying a flame, can hint at whether a product behaves like shilajit, but none of them measure fulvic acid content. That requires laboratory separation and weighing. Home tests are a rough screen, not a measurement.
Is fulvic acid safe to take every day?
Research on fulvic acid in people is still limited, and most shilajit safety data relates to purified shilajit rather than isolated fulvic acid. Unpurified material can carry heavy metals and other contaminants. Use a purified product with third-party testing, and speak to a qualified healthcare professional before taking it daily, particularly if you are on medication, pregnant or breastfeeding.
Sources and further reading
- Lamar RT, Olk DC, Mayhew L, Bloom PR. A new standardized method for quantification of humic and fulvic acids in humic ores and commercial products. Journal of AOAC International. 2014;97(3):721-730. PubMed 25051616
- International Organization for Standardization. ISO 19822:2018, Fertilizers and soil conditioners: determination of humic and hydrophobic fulvic acids concentrations in fertilizer materials. iso.org
- Agarwal SP, Khanna R, Karmarkar R, Anwer MK, Khar RK. Shilajit: a review. Phytotherapy Research. 2007;21(5):401-405. PubMed 17295385
- Stohs SJ. Safety and efficacy of shilajit (mumie, moomiyo). Phytotherapy Research. 2014;28(4):475-479. PubMed 23733436
- Winkler J, Ghosh S. Therapeutic potential of fulvic acid in chronic inflammatory diseases and diabetes. Journal of Diabetes Research. 2018;2018:5391014. PMC6151376
- Carrasco-Gallardo C, Guzman L, Maccioni RB. Shilajit: a natural phytocomplex with potential procognitive activity. International Journal of Alzheimer’s Disease. 2012;2012:674142. PubMed 22482077
Reviewed and updated: September 2026. This page is general information, not medical advice. Please speak to a qualified healthcare professional before starting any supplement. See our full disclaimer.