Fulvic acid is the ingredient shilajit sellers talk about most, often alongside the phrase “fulvic minerals”. But what is it, and what does the evidence actually say? This article explains fulvic acid and the minerals in shilajit in plain terms.
What is fulvic acid?
Fulvic acid is a humic substance. Humic substances are the organic compounds left when plant matter decays over long periods. They are also found in soil, peat and water.
Fulvic acid is the smallest and most water-soluble part of this humic material. It has a low molecular weight, around 2 kDa, and dissolves in water across a range of acidity. It isn’t a single molecule but a family of related compounds. Its exact make-up depends on where it came from.
In shilajit, humic substances make up the bulk of the resin. One review puts them at more than 80% by weight, and an earlier one at 60% to 80%.
What are “fulvic minerals”?
“Fulvic minerals” is a marketing phrase rather than a scientific term. It usually means minerals that are bound to fulvic or humic acid.
That binding is real. A 2026 analysis of 12 shilajit samples found that most metals were attached to small molecules, the size of humic acid and metal complexes. Calcium was the most plentiful element, present largely as a calcium lactate complex.
Which minerals does shilajit contain?
Minerals make up about 20% of shilajit. The main ones by weight are:
- Calcium, usually the most abundant
- Potassium
- Magnesium
Smaller traces include iron, zinc, manganese, chromium, selenium and cobalt. The mix depends on the rock the shilajit forms in.
You will often see “84 minerals” on labels. A 2024 review counted around 65 metals reported in research, many in tiny amounts. That list includes toxic metals such as lead, arsenic, cadmium and mercury. So more minerals is not necessarily better.
How much fulvic acid does shilajit contain?
It varies enormously. A processed extract used in one rat study was standardised to 56.75% fulvic acids. A purified product used in a 2003 human study measured just 6.61% crude fulvic acid.
Labs also use different test methods, so figures from different products aren’t always comparable. A very high fulvic acid claim should name its test method.
What does research say fulvic acid does?
Less than many websites suggest. Most research on fulvic acid is lab and animal work, looking at things like immune cells and inflammation markers. A 2014 review named fulvic acid and dibenzo-alpha-pyrones as the compounds that “appear to be” behind shilajit’s reported effects.
The few human trials of fulvic acid used a lab-made version, produced from sugar. It contains none of shilajit’s minerals. No trial has tested fulvic acid from shilajit on its own in people.
Does fulvic acid carry minerals into cells?
You will often read that fulvic acid carries minerals and nutrients deep into the body. This hasn’t been shown in people.
Lab studies show fulvic acid can bind minerals and some medicines. Pharmacy researchers have used fulvic acid from shilajit to change how certain drugs dissolve. That is where the “carrier” idea comes from. It also means fulvic acid could, in theory, affect how some medicines are absorbed. If you take regular medication, ask your pharmacist before trying shilajit.
Is fulvic acid safe?
At supplement amounts it looks low-risk, with caveats. A 2015 review states that fulvic acid is safe in humans up to 1.8 g a day for adults.
The bigger issue is the source. Natural fulvic acid carries whatever its source contains, including heavy metals. That is why a batch lab test matters more than a fulvic acid percentage. You can see the heavy-metal results for Hilasti’s shilajit on our lab results page.
The short version
Fulvic acid is the main organic part of shilajit, and the minerals are mostly calcium, potassium and magnesium. Both vary from source to source. Claims that “fulvic minerals” improve absorption or health go beyond what has been tested in people. For more on the resin itself, read what is shilajit.
Hilasti’s shilajit is sold as a raw resin; see the shop.
This article is for information only and isn’t medical advice. Speak to your doctor or pharmacist before taking a supplement, especially if you’re pregnant, breastfeeding, take medication or have a health condition.
