If you work with nutrition clients, supplements will come up in almost every session. A client saw something online. A friend swears by a powder. A practitioner they used to see sold them a shelf of bottles. How you handle these conversations says a lot about whether you can be trusted.
Start with what the FDA does and does not do
Many clients assume a supplement on a store shelf has been checked and approved the way a prescription drug is. It has not.
According to the FDA, under the Dietary Supplement Health and Education Act the agency does not have the authority to approve dietary supplements before they are marketed, and by law it does not approve supplements or their labeling. Manufacturers and distributors have the first responsibility for making sure their products are safe and properly labeled. The FDA’s role is mostly enforcement after a product is already on the market.
Clients are often surprised by this. Telling them is not scaremongering. It is giving them the information they need to ask better questions.
What the label is allowed to say
Supplements may not claim to treat, prevent, or cure a disease. A product marketed that way is treated as a drug. They may make structure or function claims, such as a claim about supporting a body function, and when they do, the label has to carry the FDA’s disclaimer: the statement has not been evaluated by the Food and Drug Administration, and the product is not intended to diagnose, treat, cure, or prevent any disease.
Show a client that disclaimer on their own bottle. It is one of the most useful two minutes you can spend.
The medication line
This is the bright line, and it does not move. If a client takes any medication, questions about whether a supplement is safe alongside it go to the prescriber or the pharmacist. So do questions about whether a supplement can replace a medication, or whether they can cut a dose because they are now taking something “natural.”
The wording is simple: “That is a question for your doctor or your pharmacist. Please ask before you start or stop anything.” Pharmacists are an underused resource here. Clients can usually ask one at the counter, and checking interactions is part of their job.
Apply the same rule when a client is pregnant or breastfeeding, is preparing for surgery, or has a diagnosed condition. And write it down every time, the same way you would any referral. Our post on when a nutritionist should refer a client out covers what to record.
Education versus recommendation
There is a real difference between these two sentences:
- “Here is what a supplement facts label shows, and here is what that disclaimer means.”
- “You should take this brand at this dose for your condition.”
The first is general education. The second is an individualized recommendation, and for a client with a health condition it can cross into territory your state reserves for licensed professionals. Where that line sits depends on your state, which we cover in how to check your state rules before taking nutrition clients.
When in doubt, stay on the education side, and send the specific product-and-dose question to the client’s physician, pharmacist, or a registered dietitian.
Questions to teach clients to ask
Instead of telling a client what to take, teach them how to evaluate what they are being sold:
- What is the claim, exactly? “Supports energy” is a different kind of claim from “fixes your thyroid.” If a product implies it treats a disease, that is a warning sign.
- Who is telling me this, and do they earn from it?
- Has the product been tested by an independent third party to check that it contains what the label says? Some testing programs put a seal on products that pass. A seal is about what is in the bottle, not about whether the product works.
- Have I asked my pharmacist whether it interacts with anything I take?
- What problem am I trying to solve, and is there a food or routine change that would solve it first?
That last question is often where the real coaching work is.
If you sell supplements
Some nutrition practitioners sell supplements, either their own brand or through an affiliate or direct-sales arrangement. That is a business choice, and it comes with an obligation.
The Federal Trade Commission’s guidance on endorsements says that when you have a material connection to a product, such as being paid, earning a commission, getting free product, or selling your own brand, you should disclose it clearly and conspicuously, where people will not miss it. That applies to your website, your social posts, and your affiliate links.
With clients, go further than the minimum. Say it out loud before you recommend anything: “I want you to know I earn a commission on this product.” Then make it genuinely fine for them to say no, or to buy something else. A client who suspects you are selling to them stops trusting your advice about everything else, including the advice that has nothing to do with a bottle.
And never make purchasing a product a condition of working with you.
Write it down
Keep supplements in the client record. At intake, ask what they take, including vitamins, powders, and herbal products, and note it. When they mention a new one, note it. When you send a question to their prescriber or pharmacist, note that too, with the date.
The short version
The FDA does not approve supplements before they are sold, and labels cannot claim to treat disease. Medication questions always go to the prescriber or pharmacist. Educate rather than prescribe, especially for anyone with a health condition. Teach clients the questions to ask. If you earn anything from a product, say so clearly, before you recommend it. And keep it all in the record.
Questions people ask
Can a nutrition coach recommend supplements?
It depends on your state's rules and on the client. General education about what a supplement is and what the label means is different from recommending a specific product and dose for one person's health. Whenever a client takes medication, is pregnant, or has a diagnosed condition, send the supplement question to their physician or pharmacist.
Are dietary supplements approved by the FDA?
No. According to the FDA, under the Dietary Supplement Health and Education Act the agency does not have the authority to approve dietary supplements before they are marketed, and it does not approve supplements or their labeling. Manufacturers and distributors are responsible for making sure their products are safe and properly labeled.
What should I say when a client asks if a supplement is safe with their medication?
Tell them plainly that this is a question for their prescriber or pharmacist, and ask them not to start, stop, or change anything until they have asked. Then write down in their record that you said so.
Do I have to disclose if I sell supplements to my clients?
Yes. The Federal Trade Commission's guidance says a material connection, such as being paid, earning a commission, getting free product, or selling your own brand, should be disclosed clearly and conspicuously. With clients, the honest practice is to say it before you recommend anything, every time.
What does “this statement has not been evaluated by the FDA” mean?
It is a disclaimer the FDA requires on supplement labels that make structure or function claims, such as a claim about supporting a body function. It means the FDA has not reviewed that claim. The label must also say the product is not intended to diagnose, treat, cure, or prevent any disease.
This article is general educational information, not medical, dietetic, or legal advice, and is not a substitute for care from a licensed physician or registered dietitian. Certifications offered on this site are private credentials, not a government license and not the Registered Dietitian (RD/RDN) credential. Nutrition practice is regulated differently in each state; confirm what you are permitted to do in your state before practicing.