What is NCCIH and why does their guidance matter?
The National Center for Complementary and Integrative Health (NCCIH) is the U.S. federal government's primary agency for scientific research on complementary and integrative health practices. It operates as one of the 27 institutes and centers of the National Institutes of Health (NIH) and is the closest thing the United States has to an official position on dietary supplement safety.
When someone searches "nccih shilajit" or "national center for complementary integrative health shilajit," they are typically trying to answer one of two questions: is shilajit safe according to the U.S. government, and what specifically are the official concerns? The NCCIH does have documented guidance on shilajit — and it is more nuanced than most supplement marketing and most supplement criticism suggests.
Scope of this guide: We cover what NCCIH actually says about shilajit (and what they don't say), the specific contamination distinction their guidance implies, and how their criteria map to verifiable product standards. For a broader safety overview, see our complete shilajit safety guide.
What NCCIH says about shilajit
NCCIH's documented concerns about shilajit fall into three categories. Understanding each one precisely matters because they carry very different practical implications for consumers.
NCCIH documents that shilajit can contain heavy metals — including lead (Pb), arsenic (As), mercury (Hg), and cadmium (Cd) — at levels that may be harmful. This concern stems from the nature of shilajit as a mineral pitch exudate from rock formations: it bioaccumulates metals present in its surrounding geology. The concern is real, well-documented, and supported by independent testing of commercial products.
NCCIH notes that while there is some laboratory and animal research supporting shilajit's traditional uses, high-quality human clinical trials are limited in number, sample size, and duration. Most of the available RCTs have been conducted in small populations over 90-day periods. This is an accurate characterization of the evidence landscape — not a claim that shilajit is ineffective.
NCCIH flags shilajit as potentially unsafe during pregnancy. The basis is a combination of no clinical safety data for pregnant or breastfeeding populations and the elevated risk profile of heavy metal exposure for fetal and infant development. This is a standard precautionary position for any supplement without pregnancy-specific safety data.
What NCCIH does not say
The NCCIH guidance is frequently mischaracterized in both directions — by supplement marketers who ignore it entirely, and by critics who overstate it as a categorical condemnation. Here is what the guidance explicitly does not say:
“NCCIH says shilajit doesn't work”
FalseNCCIH documents limited clinical evidence — a statement about research quantity and quality, not compound efficacy. The absence of large RCTs is not the same as evidence of inefficacy.
“NCCIH says shilajit is dangerous”
OverstatementNCCIH flags contamination risk in unverified products. They do not make a blanket safety determination about purified, lab-tested shilajit with verified heavy metals panels.
“NCCIH says all shilajit has unsafe metals”
FalseThe heavy metals warning applies to unprocessed or unverified products. Lab-tested products with ICP-MS panels below FDA action levels address the specific concern NCCIH raises.
“NCCIH recommends against shilajit use”
OverstatementNCCIH recommends caution — particularly around product quality verification and pregnancy avoidance. This is materially different from a recommendation against use for healthy adults using verified products.
The contamination distinction: raw vs. purified shilajit
The most important nuance in the NCCIH guidance — and the one most commonly missed in mainstream coverage — is that their heavy metals concern is specifically about contamination risk, not about shilajit as a compound. This distinction separates the product quality problem from the substance itself.
- Collected directly from rock formations — not purified
- Heavy metals present at variable, geography-dependent levels
- No lab verification — metals not quantified or disclosed
- This is what NCCIH's contamination warning applies to
- Common in undisclosed supply chains and cheap products
- Processed to remove or reduce heavy metal content
- Tested by ISO/IEC 17025-accredited labs via ICP-MS
- Batch-specific COA with actual measured metal values
- Values disclosed and verifiable against FDA limits
- Directly addresses the contamination concern NCCIH raises
Shilajit sourced from high-altitude deposits (above 14,000 ft) and processed using traditional purification methods tends to contain significantly lower heavy metal concentrations than samples from lower-altitude or industrially contaminated regions. Geographic source and processing methodology are the two variables that most determine whether a product's heavy metals profile addresses the NCCIH concern — or confirms it.
How to apply NCCIH guidance when buying shilajit
NCCIH's concerns translate directly into a four-point verification checklist that any serious buyer can apply before purchasing:
Demand an ICP-MS heavy metals panel
Inductively Coupled Plasma Mass Spectrometry (ICP-MS) is the gold standard method for detecting lead, arsenic, mercury, and cadmium at parts-per-billion sensitivity. Any COA that lists heavy metals detected by a method other than ICP-MS (or does not specify the method) should be treated skeptically. The test must cover all four primary metals: Pb, As, Hg, Cd.
Verify the lab's accreditation
The lab performing the ICP-MS analysis must hold ISO/IEC 17025 or A2LA accreditation — the internationally recognized standard for analytical testing laboratory competence. Accreditation numbers are public record and can be verified directly with the accrediting body. A COA from an unaccredited lab provides no meaningful safety assurance.
Require batch-specific COA with actual values
A COA should show specific measured values for each metal (e.g., Pb: 0.040 mcg/serving) — not ranges, not 'below detection limit' without the detection limit stated, and not a single COA applied to all batches. Batch-specific documentation is the only way to verify that the product you purchased from a particular production run was actually tested.
Compare values against FDA limits
FDA action levels for heavy metals in dietary supplements: Lead (Pb) — 10 mcg/day; Arsenic (As) — 15 mcg/day inorganic; Mercury (Hg) — 30 mcg/day methylmercury; Cadmium (Cd) — varies. California Prop 65 limits are stricter: Lead — 0.5 mcg/day. Look for brands whose COA values fall below the more stringent of these two thresholds.
For brand-by-brand heavy metals data across all five partners, see our shilajit heavy metals comparison →
Brands that directly address NCCIH's concerns with verifiable data
Each of the following brands has a publicly accessible, batch-specific COA from an accredited third-party laboratory. All heavy metals reported are below FDA dietary supplement action levels.
Black Lotus Shilajit
IAS Laboratories, Phoenix AZ · Batch 93 · Altai Mountains, Siberia
COA data addressing NCCIH concerns:
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Lotus Blooming Herbs Authentic Shilajit™
Certified Laboratories, Burbank CA · A2LA ISO 17025 Cert 3034.01 · Batch BHC4429 / 2024057703 · GMP Certified · Ayurvedic practitioner-owned
COA data addressing NCCIH concerns:
Note: Lotus Blooming Herbs does not disclose fulvic acid percentage on their COA. Their verification strength is in the heavy metals panel and accreditation credentials.
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Additional verified options
NCCIH vs. Memorial Sloan Kettering: how official guidance compares
NCCIH is not the only major institution that has documented shilajit safety considerations. Memorial Sloan Kettering Cancer Center maintains an integrative medicine database that independently reaches similar conclusions — and similar nuances.
| Concern | NCCIH | Memorial Sloan Kettering |
|---|---|---|
| Heavy metals | Flags contamination risk in unverified products | Flags heavy metal contamination as a documented safety concern |
| Human evidence | Notes limited high-quality clinical trials | Notes most studies are small and short-term |
| Pregnancy | Recommends avoidance — no safety data | Precautionary avoidance — no clinical data for this population |
| Compound safety | No blanket condemnation of purified shilajit | No categorical rejection — flags product quality variation |
| FDA status | Not approved — dietary supplement | Not FDA-approved as a drug |
For a full breakdown of Memorial Sloan Kettering's position, see our MSK and shilajit guide →
The bottom line on NCCIH guidance
The concern is product quality, not the compound
NCCIH's heavy metals warning applies to unverified, unpurified products. It is not a condemnation of shilajit as a substance. Purified, lab-tested products with ICP-MS panels and accredited COAs directly address what NCCIH flags.
The evidence gap is real but overstated
NCCIH is correct that shilajit lacks large-scale, long-duration RCTs. The available trials are small and mostly 90-day studies. This is an accurate description of a research gap, not a verdict that the compound is ineffective.
Pregnancy avoidance is the correct precautionary position
No safety data exists for pregnant or breastfeeding populations. The NCCIH recommendation to avoid shilajit during pregnancy is appropriate given the known fetal toxicity of heavy metals at low doses and the absence of pregnancy-specific clinical data.
Verification is straightforward — use the checklist
ICP-MS panel + ISO/IEC 17025 accredited lab + batch-specific COA + values below FDA limits. These four criteria directly address every documented NCCIH concern about product quality. All five brands reviewed above meet this standard.
Related safety guides
64.51% fulvic acid (Batch 93, IAS Labs) · Third-party COA · Cold-processed · Free shipping — S-tier resin at $36.99.
- 64.51% fulvic acid — Batch 93 COA, IAS Laboratories Phoenix AZ
- 161mg fulvic acid per serving (June 2025 COA)
- Heavy metals (ICP-MS): Lead 1.17 ppm · Mercury ND · all within FDA limits
- Microbiology: Listeria ND · Salmonella Absent · E. coli ND
- Cold-process purification preserves bioactive compounds
- Free shipping on all orders
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Frequently asked questions
Does NCCIH say shilajit is safe?
NCCIH does not make a blanket safety endorsement of shilajit, but they also do not say it is unsafe as a compound. Their guidance specifically flags two concerns: heavy metal contamination in unverified products, and a lack of sufficient high-quality human clinical evidence. These are product quality concerns and research-gap concerns — not a determination that the compound itself is harmful. NCCIH's position is that consumers should exercise caution about product quality rather than avoiding shilajit categorically.
What heavy metals does NCCIH warn about in shilajit?
NCCIH's concern encompasses the full range of heavy metals that can be present in mineral pitch compounds sourced from rock formations: lead (Pb), arsenic (As), mercury (Hg), and cadmium (Cd). All four can be present in raw, unprocessed shilajit at levels that vary by geographic source and processing method. NCCIH's warning is specifically about unverified or unpurified products — not purified, lab-tested shilajit that has been shown to contain these metals below FDA action thresholds.
Is shilajit FDA approved?
No. Shilajit is sold in the United States as a dietary supplement under DSHEA (Dietary Supplement Health and Education Act of 1994), not as an FDA-approved drug. The FDA does not pre-approve dietary supplements before they reach market, but manufacturers must comply with FDA Good Manufacturing Practices (GMPs) and may not make disease claims. The absence of FDA approval is not a safety disqualification — it is the standard regulatory status for all dietary supplements including vitamin D, magnesium, and fish oil.
What does NCCIH say about shilajit and pregnancy?
NCCIH guidance, consistent with most integrative medicine databases, flags shilajit as potentially unsafe during pregnancy and breastfeeding. The concern is two-fold: first, no clinical safety data exists for these populations; second, heavy metal contamination in unverified products poses heightened risk to fetal and infant development given well-established fetal neurotoxicity of lead and mercury at low exposures. The precautionary recommendation is avoidance during pregnancy and breastfeeding regardless of product quality.
How do I find a shilajit brand that addresses NCCIH concerns?
NCCIH's specific concerns map directly to verifiable product criteria: (1) Get an ICP-MS heavy metals panel — this is the gold standard analytical method for detecting lead, arsenic, mercury, and cadmium at parts-per-billion sensitivity. (2) The lab must be ISO/IEC 17025-accredited or A2LA-accredited — these are the internationally recognized standards for analytical testing laboratory competence. (3) The COA should be batch-specific with actual measured values, not generic range claims. (4) Lead should be below the FDA dietary supplement action level of 10 mcg/day. Brands like Black Lotus Shilajit (IAS Laboratories, Phoenix AZ) and Lotus Blooming Herbs (Certified Laboratories Burbank CA, A2LA ISO 17025) meet all of these criteria with publicly verifiable data.
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Adrian Voss is the founder of ShilajitPrice.com and a trained anthropologist with a focus on Cultural Anthropology and traditional medicine practices across the Carribbean, Central Asia and the Himalayas. He first encountered shilajit through his research studying traditional healing systems and Eastern Religion and has used it personally for over six years. Frustrated by the lack of transparent, data-driven information in the Western supplement market, he built ShilajitPrice.com to bring the same rigorous standards of research he applies in academic work to consumer supplement buying — starting with verified lab data, honest sourcing claims, and real price transparency.