Fulvic Acid (Humic Substance · Mineral Transport · Adaptogenic)
| Compound | Fulvic Acid (Fulvic Acid Complex; FA; Low-molecular-weight humic substance fraction) |
| Class | Humic Substance (Heterogeneous organic acid polymer) |
| CAS | 479-66-3 (representative; fulvic acid is structurally heterogeneous) |
| Molecular formula | Heterogeneous (MW ~500–5,000 Da; variable functional groups) |
| Primary sources | Shilajit (Asphaltum punjabianum; himalayan resin), soil humus, leonardite, fulvic acid-rich mineral deposits |
| Plant part | Mineral exudate (not a conventional plant part) |
| Claim strength | Moderate |
| Key applications | Mineral transport / bioavailability enhancement; antioxidant; gut microbiome; adaptogenic; cognitive |
| Buy from Herbuno |
Shilajit Extract Powder (80% Fulvic Acid) | Shilajatu → Organic Shilajit (Asphaltum punjabianum) Powder | Shilajatu → |
Name origin: Fulvic acid derives its name from the Latin "fulvus" (yellow/tawny) — reflecting the characteristic yellow-brown colour of dilute fulvic acid solutions. It is the low-molecular-weight, water-soluble fraction of humic substances — the complex organic matter produced by microbial decomposition of plant material over geological time. Fulvic acid differs from humic acid (which is higher molecular weight and insoluble at low pH) and from the mineral fraction of shilajit. Traditional use: Shilajit — the primary commercial source of fulvic acid — has one of the oldest and most extensive traditional medicine histories of any substance used in Ayurveda. Described in Charaka Samhita and Sushruta Samhita as Shilajatu (destroyer of mountains, conquerer of weakness), it has been used for over 3,000 years as a Rasayana (rejuvenating tonic) for physical strength, sexual function, cognitive enhancement, anti-ageing, and as a general adaptogen. The active fraction responsible for Shilajit's pharmacological activity is primarily the fulvic acid complex (70–85% of the organic matter in processed Shilajit) alongside dibenzo-alpha-pyrones and mineral elements. Research trajectory: Modern research has validated several traditional Shilajit applications with mechanistic grounding — particularly cognitive support (Alzheimer's preclinical), testosterone support (male reproductive RCTs), and physical performance (fatigue reduction). Fulvic acid specifically has been characterised as a mineral transporter, antioxidant, and gut microbiome modulator. Commercial source: Shilajit Extract Powder (80% Fulvic Acid) is available from Herbuno — among the most highly standardised Shilajit preparations available commercially, with guaranteed fulvic acid content.
Evidence for Fulvic Acid Applications
Mineral transport and bioavailability enhancement: Fulvic acid forms stable chelate complexes with minerals (iron, zinc, magnesium, copper) — small enough to be transported across cell membranes, enhancing intracellular mineral delivery. This mineral chelation is proposed as the primary mechanism for fulvic acid's enhancement of micronutrient bioavailability. In vitro and animal studies demonstrate improved iron absorption in iron-deficiency models. Claim strength: Moderate.
Cognitive support and Alzheimer's research: Fulvic acid has been shown to inhibit tau protein aggregation — a pathological hallmark of Alzheimer's disease — in cell-free aggregation assays and neuronal cell models. The proposed mechanism involves direct interaction with tau protein's proline-rich regions, disrupting beta-sheet-rich aggregate formation. Shilajit RCTs for cognitive function in healthy older adults show modest but statistically significant improvements in working memory and spatial attention. Claim strength: Moderate.
Testosterone and male reproductive support: A double-blind RCT (Pandit et al. 2016, Andrologia) with 250 mg Shilajit extract twice daily for 90 days in healthy men aged 45–55 demonstrated significant increases in total and free testosterone, DHEA, and gonadotropin levels versus placebo. The mechanism involves steroidogenesis pathway support, potentially via CoQ10 precursor (dibenzo-alpha-pyrone) enhancement of mitochondrial function in Leydig cells. Claim strength: Moderate.
Antioxidant and anti-inflammatory: Fulvic acid's polyphenolic carboxylate groups confer direct radical scavenging (DPPH, ABTS), iron chelation-based antioxidant activity, and NF-κB pathway modulation. In gut models, fulvic acid reduces LPS-induced inflammatory cytokine production in intestinal epithelial cells, suggesting gut mucosal protective activity. Claim strength: Moderate.
Shilajit Extract Powder (80% Fulvic Acid) | Shilajatu →
Organic Shilajit (Asphaltum punjabianum) Powder | Shilajatu →
Browse Standardised Extract Powders →
Dosage & Formulator Specification
The Pandit et al. 2016 testosterone RCT used 250 mg standardised Shilajit extract (fulvic acid-standardised) twice daily = 500 mg/day. Cognitive and fatigue studies have used 200–500 mg/day total Shilajit extract. For Herbuno's Shilajit Extract Powder at 80% Fulvic Acid: 125–250 mg of the extract delivers 100–200 mg pure fulvic acid, consistent with RCT dosing ranges.
Formulation specification options: (1) 80% Fulvic Acid Shilajit extract — highest standardisation, suitable for clinical-intent sports nutrition, cognitive, and men's health formulations; (2) Organic Shilajit powder (lower standardisation, full mineral matrix) — whole-food positioning with broader micronutrient profile; (3) Purified fulvic acid isolate (not currently in Herbuno catalogue) — for ultra-precise dosing in pharmaceutical-grade contexts. The 80% extract is the recommended commercial choice for supplement manufacture.
Compatibility: Fulvic acid's mineral-chelating properties mean it should be separated from mineral supplementation by 1–2 hours if used as a mineral bioavailability enhancer (to avoid chelating the supplemental minerals before absorption). Combining fulvic acid directly with mineral supplements may actually enhance absorption — the context of co-formulation versus sequential administration matters. Stable in solid dosage; aqueous solutions darken over time but retain activity. Compatible with adaptogens (ashwagandha, rhodiola), CoQ10, and testosterone support formulas (zinc, vitamin D3).
Heavy metal monitoring is essential for all Shilajit products — the mineral-rich geological matrix can accumulate heavy metals (lead, arsenic, mercury). Quality-controlled Shilajit extraction and purification processes include heavy metal testing. Require supplier CoA with heavy metal analysis (lead <0.5 ppm, arsenic <0.5 ppm, mercury <0.1 ppm) alongside fulvic acid content certification for all Shilajit products.
Frequently Asked Questions — Fulvic Acid
What is the difference between fulvic acid and humic acid?
Both are humic substances — organic matter products of microbial decomposition — but they differ in molecular weight, solubility, and biological activity. Fulvic acid (MW ~500–5,000 Da) is water-soluble at all pH values, more bioavailable, and contains a higher proportion of carboxylic and hydroxyl functional groups relative to aromatic carbon. Humic acid (MW ~5,000–100,000+ Da) is insoluble at low pH, less bioavailable, and more abundant in soil humus by mass. For supplement applications, fulvic acid is the bioactive fraction of interest; Shilajit extracts standardised to fulvic acid ensure consistent delivery of the lower-MW, bioavailable fraction.
Is Shilajit safe? What are the main quality concerns?
Authentic, purified Shilajit from quality suppliers is generally well-tolerated at recommended doses. The primary safety concern is heavy metal contamination — raw Shilajit from geological deposits can contain elevated lead, arsenic, and mercury from surrounding rock. Proper purification and third-party heavy metal testing are non-negotiable quality requirements. Secondary concerns include adulteration (dilution with leonardite or coal humic extracts that are cheaper but less bioactive) and mycotoxin contamination from low-quality processing. Herbuno's Shilajit Extract Powder should be accompanied by a full CoA including heavy metals and fulvic acid content.
Does fulvic acid interact with prescription medications?
Fulvic acid's mineral chelation and potential CYP enzyme modulation are theoretical interaction risks. Iron chelation may reduce iron medication absorption if taken simultaneously — separate by 2 hours. CYP3A4 induction has been observed in some in vitro studies, potentially affecting drugs metabolised by this enzyme; clinical relevance at typical supplement doses is unknown. Shilajit preparations are generally considered safe at standard doses in healthy adults; patients on complex drug regimens should consult a healthcare provider before supplementing.
What is the Ayurvedic Rasayana category and how does Shilajit fit?
Rasayana is an Ayurvedic category of rejuvenating substances that promote longevity, cognitive function, physical strength, and immune resilience — the ancient equivalent of modern adaptogen or anti-ageing compound classification. Shilajit is classified as a Rasayana in Charaka Samhita and is one of the eight Maha Rasayanas (great rejuvenators). Modern pharmacological validation has supported several Rasayana attributes: testosterone support (male vitality), cognitive protection (tau aggregation inhibition), mitochondrial function enhancement (CoQ10 pathway), and adaptogenic stress response modulation — making Shilajit one of the better-evidenced Rasayana substances.
Related compounds: Beta-Ecdysterone, Shilajit, Beta-Sitosterol, Friedelin
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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