Fulvic acid testing: why percentages don’t compare

A fraction defined by method

Fulvic acid is the part of humic substances that stays dissolved at any pH. Laboratories isolate it by dissolving, acidifying and separating humic material, then measuring what remains; see humic substances. Each step can be done differently, so the amount counted as “fulvic acid” depends on the procedure. Fulvic acid is listed among shilajit’s main components,^[1] but its measured percentage is a product of the method as well as the material.

Why results differ between labs

As sold vs dry weight

A dry-weight result excludes moisture, so it is higher than an as-sold result for the same resin. A resin with 15% moisture, for example, would show a dry-weight figure about 18% higher than its as-sold figure. Always check which basis a figure uses before comparing; see processing and composition.

How to compare fairly

1. Find the methodNamed on the report.
2. Find the basisAs sold or dry weight.
3. Check the batchEach figure should relate to the batch on sale.
4. Compare only matching methodsOtherwise, treat figures as unrelated.

Fulvic acid claims

Labels sometimes advertise very high fulvic acid percentages, or “up to” figures. Without the method and basis, those numbers can’t be compared. Our claim check is fulvic acid percentage claims, and whether more is better is covered in can more fulvic acid mean better shilajit?

Composition reports and batches

Fulvic acid is often measured in a separate composition report, sometimes by a different laboratory and on a different sample from the contaminant panel. For example, an IAS composition report published by Nature Elixirs relates to a sample received on 1 November 2024, not batch SJ2509.^[2] That is common practice; it simply means the composition figure describes that earlier sample. Nature Elixirs is an evaluated brand on Best Shilajit UK. Its fulvic acid information is discussed here because the brand has published a separate composition report for an earlier sample.

Keep fulvic acid in perspective

A fulvic acid figure describes composition, not safety. Contaminant results come first; fulvic acid is useful context and a way to check consistency between batches of the same product measured the same way; see fulvic acid in shilajit.

Why brands test fulvic acid at all

Fulvic acid testing helps a brand describe its product and check consistency between batches. It is also used in marketing. Both uses are legitimate, as long as the method is stated and the figure isn’t presented as a measure of safety or effectiveness.

Humic acid and total humic substances

Some reports also give humic acid or total humic substances. The same caveat applies: these are method-defined fractions, and figures from different procedures aren’t comparable. A total humic figure combines fractions and depends on the method used to separate them; see humic substances explained.

Using fulvic acid figures to check consistency

If a brand reports fulvic acid by the same method for every batch, a large change between batches is worth asking about, even though neither figure is a quality score. Consistency is the most practical use of the figure for buyers.

Standardised extracts

Standardised extracts are often specified to a fulvic acid range by the producer’s method. That ensures consistency within that product, but doesn’t make the figure comparable with other products; see standardised extracts.

Putting it into practice

When comparing products, set fulvic acid aside until you have checked contaminant results and batch matching. Then, if fulvic acid matters to you, compare only figures measured by the same method and basis, and remember that a higher number isn’t evidence of a better product.

Questions to ask

1. Which method measured fulvic acid?
2. Is the figure as sold or dry weight?
3. Which batch or sample does it describe?

A note on marketing

Be cautious of products that lead with fulvic acid figures but don’t publish contaminant results. Composition figures are useful context, but safety evidence should always come first, and a brand that understands this will publish both clearly. Treat any fulvic acid number without a method and basis as a marketing figure rather than a laboratory result.

The bottom line

Fulvic acid percentages depend on the method and basis. Compare only figures measured the same way, on the same basis and for the right batch, and never let a high percentage stand in for contaminant testing.

Related reading