Heavy Metals in Peptides, SARMs, and Research Chemicals

Abstract

Injectable peptides, oral selective androgen receptor modulators, anabolic-androgenic steroids, and the raw powders they are reconstituted from occupy a gap that no product-safety framework fills. In the eyes of the United States Food and Drug Administration they are unapproved or misbranded drugs, so the elemental-impurity controls that every licensed medicine must pass never apply to them; they are not foods or dietary supplements, so the limits that govern those never apply either. They are manufactured, in the main, by unregulated overseas synthesis without the purification a pharmacopeia demands, and then sold as powder for a buyer to dissolve at home. The first forensic survey of this market found lead in every product class it tested and metal loads that, at realistic doses, approach the daily exposure limits set for medicines. This briefing sets out what the published record measures, why an injected or gray-market product is uniquely exposed, why a company that will not stop selling should at least be testing, and how the Heavy Metal Tested & Certified program approaches a class it certifies for heavy-metal safety only. The program does not endorse, approve, or vouch for the efficacy or the legality of these products. It certifies one thing: that the metal content has been measured against a published method and a toxicological ceiling, on every lot.

A class the safety system never reaches

Every medicine sold lawfully in a regulated market carries a control the buyer never sees. Before a licensed drug reaches a patient, its manufacturer must show that the trace metals left behind by synthesis — catalyst residues, reagent contamination, leachables from equipment — sit below a permitted daily exposure derived from toxicology. That control is the International Council for Harmonisation’s Q3D guideline, adopted in the United States Pharmacopeia as General Chapters <232> and <233>, and it sets an explicit daily limit for two dozen elements, route by route: one ceiling for a drug you swallow, a tighter one for a drug you inject, a tighter one still for a drug you inhale ^[2][3].

Peptides, SARMs, and research chemicals never meet that control, because they are never licensed drugs. The Food and Drug Administration treats selective androgen receptor modulators as unapproved drugs and has warned both companies and the public against selling and using them in body-building products ^[4]. It treats the gray-market and counterfeit versions of injectable peptide hormones — the semaglutide and tirzepatide analogs sold outside the approved supply chain — as unapproved and, in the counterfeit case, as a direct danger, seizing product and warning consumers not to use it ^[5]. Anabolic-androgenic steroids sold for muscle growth are controlled substances and unapproved drugs at once. None of these products passes through a new-drug application, so none is ever assessed for elemental impurities under Q3D. They are also, by the same legal status, not dietary supplements and not foods, so the contaminant limits that govern those categories do not reach them either.

The result is a class defined by absence. There is no lawful product heavy-metal content limit for a gray-market peptide anywhere in the world, and no certification framework has previously addressed it. The framework built to keep metal out of an injection — the one that would matter most here, because injection is the dominant route — applies only to the licensed products these are sold as alternatives to. The absence is not a technicality. It is the reason the buyer of an unregulated injectable has no assurance that a regulated patient is given as a matter of course.

What the published record measures

The gap would be hypothetical if the products were clean. The first forensic survey of the market says they are not.

In 2025 an Australian harm-reduction study analysed 28 illicit anabolic-androgenic steroid products — 16 injectable oils, 10 oral tablets, and 2 raw powders — donated anonymously by people who use them, and measured their metal content by inductively coupled plasma optical emission spectrometry against the Q3D permitted daily exposures ^[1]. Lead was quantifiable in every product class. Arsenic appeared in the injectable and oral forms. The single sharpest finding was nickel: oral products carried a mean of 27.5 µg per gram, a concentration the authors noted could exceed the 200 µg-per-day oral exposure limit depending on how much a person takes. Aluminium was the heaviest load of all, averaging 651 µg per gram in oral products and reaching 1,220 µg per gram — a metal for which no pharmacopeial daily limit even exists. Alongside the metals, the survey found that more than half the products were mislabelled or mis-sold, and of those with a stated dose only a fraction fell within five percent of the label ^[1]. A market that cannot be trusted to put the right active ingredient in the vial is not a market that can be trusted to keep lead out of it.

The mechanism behind those numbers is not mysterious. Peptide and steroid synthesis uses metal catalysts and metal-bearing reagents; the purification steps that strip catalyst residues down to pharmacopeial levels are expensive, validated, and — in a gray-market operation optimising for yield and price — routinely skipped or absent. The manufacturing sits in facilities under no good-manufacturing-practice obligation and no elemental-impurity testing requirement, frequently offshore of the market that consumes the product. The final step is often performed by the buyer: a raw powder shipped from an unregulated synthesiser is weighed and reconstituted at a kitchen table, with no analysis at any point between the reactor and the bloodstream. Each of those stages is a place a licensed manufacturer is required to control and a gray-market one is not.

Why the injected route makes it worse

Toxicology treats an injected metal differently from a swallowed one, and the difference is not small. When a metal is eaten, the gut absorbs only a fraction of it; the permitted daily exposures for an oral drug are written around that absorption discount. An injected metal skips the gut entirely and arrives in the bloodstream in full. That is why the pharmacopeial limits fall steeply from the oral route to the parenteral one: the parenteral ceiling for cadmium is a fraction of the oral, for mercury a tenth of it, for nickel a tenth again ^[2][3]. A concentration that would clear the oral limit can breach the injected one many times over.

This is the route that dominates the class. Injectable peptide hormones, injectable steroids, and the raw powders reconstituted into injectable oils are, per microgram of contaminant, the most severe exposure pathway in the entire product taxonomy the program covers. Aluminium makes the point most starkly. It is the one metal a government does control by the injected route — the Food and Drug Administration limits aluminium in parenteral nutrition solutions to 25 µg per litre because of its cumulative toxicity when the gut is bypassed ^[7] — and it is the metal the survey found in the greatest excess. The framework that would flag it exists; it simply does not apply to a product sold as research material rather than as medicine.

The case for testing, with or without certification

A company selling into this market carries risks it may not have priced. The clearest is liability. A product that injures a user through a contaminant it never tested for is the archetype of a failure-to-test claim, and the absence of any regulatory limit is not a shield: a plaintiff does not need to show a product exceeded a legal ceiling, only that a reasonable manufacturer would have measured what a published method makes measurable. The forensic survey has now established, in the peer-reviewed record, that heavy-metal contamination in this class is foreseeable ^[1]. Foreseeability is the hinge of a duty of care.

The second risk is commercial, and it runs the other way — toward opportunity. This is a market with no quality signal at all. Every product looks the same to a buyer: a vial, a powder, a label that the survey shows is wrong more often than not. A company that can show a credible, independent measurement of what is in its product holds the only differentiator the category permits, in front of a customer base that is, by the economics of the products, able to pay for it. The third risk is regulatory timing. Oversight of this market is not a question of whether but when; the counterfeit-semaglutide seizures and the SARM warnings are the leading edge of it ^[4][5]. A company that already tests, and can document that it tested, is positioned for a regulatory environment that has not yet arrived rather than exposed by it.

None of this requires certification. The floor is testing. A company not ready to certify — unwilling to submit to a standard, an audit, or a mark — can still send every lot to a laboratory for the elemental panel, publish or retain the result, and act on it. Heavy-metal testing is a minimum viable safety step that reduces real harm on its own, independent of any seal. The certification exists to make that testing consistent, methodologically sound, and verifiable by a third party; but the underlying act — measure the metal before a person injects it — is available to anyone, and the argument of this briefing is that it should be the baseline expectation of the class, not its premium tier.

The ethics of certifying a class like this

It would be dishonest to present this as a straightforward decision, so it is set out here as the tension it is.

The case against testing or certifying a gray-market drug class is real. A mark, or even a published test result, can be read as a signal of endorsement. The concern is legitimisation: that a heavy-metal certificate makes an unapproved and sometimes illegal product look safer, more legitimate, or more sanctioned than it is, and that in doing so it draws in users who would otherwise have been deterred by the very lack of assurance that testing removes. There is a precedent worry folded into it — that a certifier which sets foot in this market has implicitly conceded that the market should exist, and has taken on a share of responsibility for what the products do. These are not weak objections and they should not be waved away.

The counter-case is harm reduction, and it rests on a fact the objection cannot dissolve: people use these products regardless of their legal status. Anabolic-androgenic steroid use alone has an estimated global lifetime prevalence on the order of three percent, and the gray-market peptide trade has grown around the licensed weight-loss drugs faster than enforcement has followed ^[4][5][6]. The population exists, it is not waiting for permission, and its exposure to heavy metals is, on the published evidence, real and unmeasured. Against a backdrop of certain use, the choice is not between a tested product and no product; it is between a tested product and an untested one. Refusing to measure does not reduce the number of people injecting these compounds. It only guarantees that none of them knows what else is in the vial. The same logic underwrites drug-checking services, which test substances a person has already decided to take precisely because abstention is not the realistic alternative — and it is such a service that produced the survey this briefing rests on ^[1].

The way through the tension is to be exact about what is certified and what is not. The Heavy Metal Tested & Certified program certifies heavy-metal safety, and nothing else. It does not test or vouch for whether a compound is what its label says, whether it works, whether it is safe to use in any broader sense, or whether it is legal to sell or possess. It makes no claim that a certified product is a good idea. It draws the line at a single, measurable, consequential attribute — the toxic-metal content — and it protects the public by ensuring that attribute is measured to a published standard for people who are going to use these products anyway. That is the position: not endorsement, not efficacy, not legality, but the reduction of one specific and documented harm.

What HMTc actually certifies

Because no lawful product limit exists for this class, the certification cannot take the form it takes for a food or a cosmetic, where the standard is the strictest maximum level a credible government has set. There is no government maximum to adopt. The program’s method resolves that absence honestly rather than inventing a number to fill it.

Every metal in the panel is placed under a control rather than a published concentration cap. The control has three parts: mandatory testing of every certified lot by inductively coupled plasma mass spectrometry to the pharmacopeial procedure, with reflex speciation for inorganic arsenic and hexavalent chromium; a published analytical method, so the measurement is reproducible and auditable; and an escalation rule anchored not to a made-up product limit but to the route-appropriate permitted daily exposure that toxicology already provides — the parenteral limit for injectables, the oral limit for oral products, the most protective of the parenteral and inhalation limits for nasal and sublingual preparations. A result that would deliver a daily dose reaching that toxicological ceiling fails certification; any detection at all triggers a source investigation, because a contaminant present in a synthetic product signals an uncontrolled input. Methylmercury is treated as not material to a class made by chemical synthesis, which has no biological methylation pathway, and any mercury contamination is captured by the total-mercury measurement instead. The permitted daily exposures are used as toxicological reference points, never republished as if they were product-content limits, because they are not.

The literature baseline for heavy-metal occurrence in these products, and the toxicological case for why each metal is worth measuring, is maintained independently at the Heavy Metal Index. This program applies those findings to a certification decision; the two are kept editorially separate by design, so that the reference remains a reference and the standard remains accountable to it. The certification says only what it can defend: the metal content of this product has been measured, by a stated method, against a toxicological ceiling, on every lot. For a class the safety system does not otherwise reach, that is the floor worth holding.

Frequently asked questions

References

1. Craven A, Ferris J, Nielsen S, Piatkowski T (2025). Lead Astray? The Hidden Contaminants in the Australian Anabolic–Androgenic Steroid Market and Their Potential Health Impact. Drug and Alcohol Review. doi:10.1111/dar.70007
2. International Council for Harmonisation (2022). ICH Q3D(R2) Guideline for Elemental Impurities. Permitted daily exposures by oral, parenteral, and inhalation route.
3. United States Pharmacopeia. General Chapter <232> Elemental Impurities—Limits; General Chapter <233> Elemental Impurities—Procedures.
4. U.S. Food and Drug Administration (2017). FDA In Brief: FDA warns against using SARMs in body-building products.
5. U.S. Food and Drug Administration (2023–2024). Warnings on counterfeit and compounded semaglutide and tirzepatide sold outside the approved supply chain; seizure of counterfeit product.
6. Sagoe D, Molde H, Andreassen CS, Torsheim T, Pallesen S (2014). The global epidemiology of anabolic-androgenic steroid use: a meta-analysis and meta-regression analysis. Annals of Epidemiology. doi:10.1016/j.annepidem.2014.01.009
7. U.S. Food and Drug Administration. 21 CFR 201.323 — Aluminum in large and small volume parenterals used in total parenteral nutrition.
8. Heavy Metal Index, peptides / SARMs / research-chemicals literature baseline. https://heavymetalindex.com