Supplements — and Why You Should Consult an Expert

Walk into any health shop, or scroll any wellness website, and you will find shelves promising precisely what ails you: for your joints, your sleep, your hormones, your mood. What you will not find, printed anywhere on the label, is any guarantee that what is inside the bottle bears much resemblance to what is written on the outside of it.

Unlike medicines, dietary supplements are not required to prove their safety or effectiveness before they reach the shelf. They are regulated more like food than like medicine, which means a product can reach the market first and answer for itself only if something goes wrong. There is, in other words, no gold standard; no single body verifying potency, purity, or even that a capsule contains what its label claims. A systematic review published this year found that somewhere between nine and fifteen percent of supplements tested, particularly those marketed for sport, performance, and weight loss, contained prohibited or pharmacologically active substances that were never declared: stimulants, hormonal agents, and compounds capable of interacting dangerously with medication a person may already be taking.

Even setting contamination aside, the inactive ingredients rarely are. The binders, fillers, dyes, and preservatives used to hold a tablet together or extend its shelf life are not inert for the person taking them. Magnesium stearate, titanium dioxide, artificial colorings, gluten- or soy-derived fillers — for someone already managing digestive sensitivity, autoimmune activity, or hormonal imbalance, these additions can just as easily aggravate the very symptoms the supplement was meant to ease. A product that behaves beautifully in one person’s system can behave quite differently in another’s, particularly once several supplements are combined, or layered on top of a medication.

The risk multiplies considerably the moment you buy from a large online marketplace or third-party reseller, rather than directly from a reputable manufacturer or a practitioner-only supplier. It is worth being honest about what actually happens to a bottle of supplements before it ever reaches your doorstep, because very little of it is reassuring.

Begin with who is actually selling the item. A marketplace listing may be fulfilled by the platform itself, by the brand directly, or by any one of thousands of third-party sellers, and it is not always obvious which. Counterfeit and diverted stock is a genuine, well-documented problem on large online marketplaces: a listing can be hijacked, an authentic product page can quietly start shipping a counterfeit once a cheaper seller wins the featured spot, and a shopper has no straightforward way of knowing, at the point of purchase, whose product has actually landed in their basket. You may be paying for a trusted brand and receiving something manufactured in an entirely different facility, to entirely different standards, with no one accountable for the difference.

Then there is storage, which is rather less glamorous a subject than dosage but arguably just as important. Probiotics, fish oils, certain B vitamins, and many botanical extracts are sensitive to heat, humidity, and light in ways that genuinely affect potency. A bottle that has spent weeks in a delivery van in August, or sat in a warehouse with no climate control, may still look and taste exactly as it should while having lost a meaningful proportion of its active ingredient. Reputable manufacturers control this from the moment of production through to the point of sale. A third-party seller, working through a sprawling and largely invisible supply chain, very often cannot tell you how a product has been stored, for how long, or under what conditions, and has little incentive to find out, since a lost potency claim is far harder for a customer to detect or dispute than a damaged box.

Quality control tells a similar story. A manufacturer with a genuine commitment to their product will typically batch-test for potency, purity, and contaminants, and will be able to produce a certificate of analysis on request. Once that same product is repackaged, resold, or passed through several intermediary hands before reaching a marketplace listing, that chain of accountability tends to fray. Expiry dates can be altered or obscured. Products formulated for one regulatory market are sometimes sold into another where the permitted doses, additives, or claims differ considerably. None of this is necessarily visible in a five-star review, which tells you how a product was marketed and perhaps how it was packaged, but very little about what was actually inside it, or whether it will behave the same way twice.

This is precisely where trained guidance earns its place. A skilled provider does not choose a supplement because the packaging is convincing, or because it happens to be the cheapest listing in a marketplace search; they choose it because they know the manufacturer, understand its third-party testing, and can trace the supply chain back to source. They can weigh a product against your particular history, laboratory results, and current medications, and they buy from practitioner channels precisely because those channels are built to be accountable in a way an anonymous online marketplace is not. Botanical medicine, especially, is not a matter of taking whatever is popular, or whatever ranks highest in a search result; herbs are pharmacologically active, capable of real benefit and real harm in roughly equal measure, and their sourcing, dosing, and interactions all matter enormously.

Please don’t leave something this consequential to a label, a review, or a bargain listing from a seller you cannot identify. Bring your supplement cabinet to me; I would far rather review what you are already taking, and guide what comes next, than have you navigate an unregulated industry, and an even less regulated marketplace, on your own.

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Sources

– Al-Saad, N., Aljaal, S., Alessa, J., & Santhosh, M.E. “Systematic review of undeclared prohibited substances and pharmacological adulterants in dietary supplements: prevalence, detection, and risks in sport.” *Frontiers in Sports and Active Living*, 8, 2026. https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2026.1740663/full