It is often said that "a dietary supplement has no proven therapeutic effect" and that only drugs can work. This is a simplification that does not always reflect reality.
By legal definition, a dietary supplement is not a medicinal product and cannot be advertised as a treatment for disease. However, this does not automatically mean that the substances it contains are biologically inactive and lack such a function.
In medicine, what primarily determines action is the API (Active Pharmaceutical Ingredient), i.e. the active substance. It is this that produces specific physiological and therapeutic effects.
A supplement can contain exactly the same active substance as a drug. If it occurs at the appropriate dose, in the proper chemical form, and in a formulation that ensures stability and bioavailability, it is hard to claim that it "does not work" if an identical ingredient in an identical form is found in a medicinal product. For example -
- CDP-choline (citicoline) as a prescription drug
- Melatonin as an OTC drug
as well as many other products such as probiotics, vitamin D3, magnesium, potassium, omega-3 fatty acids, or various herbal extracts.
The key difference between a drug and a supplement most often does not concern the action of the active substance itself, but product quality.
Drugs are subject to rigorous manufacturing requirements and quality controls. The manufacturer must demonstrate composition compliance, product stability, and meeting specified standards. In the case of supplements, requirements are usually less strict. There is often no obligation to confirm in advance that the actual content of active substances matches the manufacturer's declaration. For this reason, supplement quality can vary greatly.
When buying a drug, we therefore have greater certainty about quality, purity, and composition compliance. However, this does not mean that every supplement is bad. There are many honest manufacturers on the market who apply high control standards and care about their customers' health.
Therefore, one cannot automatically state that "a supplement does not treat" if it contains exactly the same API, at the same dose, in the same form and formulation as a drug. One can, however, say that a drug is usually a qualitatively safer choice.
At NutriLogic, we focus on evidence-based science and substantive truth.
Try our EBM supplement encyclopedia and see for yourself what effectiveness has been proven in well-designed clinical trials. Try it for free.
~ NutriLogic Science Team