Ask a coach what a client should eat or take, and most have an answer ready before you finish the sentence. It rarely lands in the formal training plan. It comes out in a check-in reply, a quick voice note, a line in a message thread. We wanted to know how often that quiet bit of advice actually happens, so instead of guessing we audited our own data.
QuickCoach is used by more than 40,000 coaches and fitness businesses worldwide. For this report we pulled a single voluntary survey question, asking coaches which supplement categories, if any, they recommend to clients, and ran it against a randomised sample of 1,000 coaches at a 95% confidence level. The result is a rare look at the coach relationship as an advice channel from the coach's own side, rather than guessing at it from retail sales or consumer surveys.
The short answer
Most online coaches do recommend supplements. In a 2026 QuickCoach audit of 1,000 coaches, 68% recommend at least one supplement category to clients, most commonly protein, creatine, or post-workout recovery aids. The remaining 32% take a deliberate position of recommending none at all.
What this is, in one paragraph
This is a short survey of practice, not a nutrition study. We took a randomised sample of 1,000 coaches from a voluntary QuickCoach survey, drawn from a base of more than 40,000 coaches, and asked which supplement categories they recommend. The sample size was set in advance to hold the margin of error at roughly three percentage points at the 95% confidence level. Coaches could pick more than one category, or say they recommend none. Everything is aggregated and anonymised, with no individual coach identifiable. The full method sits at the foot of the page.
Do online coaches recommend supplements?
The short answer
Yes, most do. 68% of QuickCoach coaches recommend at least one supplement category to clients. The remaining 32% recommend none at all, a deliberate and consistent professional stance rather than a gap in the data.
Roughly seven in ten coaches recommend at least one supplement to their clients. The other three in ten recommend nothing, and that figure is the interesting one. It is too large and too consistent to be coaches who simply forgot to answer. It is a stance. Coaching regularly spills over into what clients eat and take, but whether it does is a choice each coach makes, not a default that comes with the job.
Do coaches recommend supplements?
Share of coaches in the audit sample (n = 1,000, multiple categories permitted)
Coaches could select multiple categories or state that they recommend none. Figures are unweighted shares of respondents.
What supplements do coaches recommend most?
The short answer
Among coaches who recommend something, protein and creatine come up most often, followed by post-workout recovery aids such as magnesium, omega-3, or collagen. Everyday health products and pre-workout or energy items are recommended far less often.
The list of what gets suggested is short. A handful of categories account for almost everything coaches put forward, and the order barely shifts across the sample. Here is how they ranked by how often coaches named them.
- 1ProteinThe default first suggestion, usually framed as a convenient way to hit a daily protein target rather than a performance product.
- 2CreatineThe one supplement with a broad evidence base behind it, and the one coaches recommend with the least hesitation.
- 3Post-workout recovery aidsJoint and inflammation support such as magnesium, omega-3, or collagen, taken around training to support repair.
- 4Everyday health and immunityGeneral multivitamins and similar daily products, not tied to a specific workout.
- 5Pre-workout and energy productsStimulant-based pre-workouts and energy aids, the category coaches name least often.
These split cleanly into two groups. The top three, protein, creatine and post-workout recovery aids, are the staples tied directly to training. A coach reaching for them is thinking about the workout in front of the client. The bottom two, everyday health products and pre-workout, sit further from the plan. They are about general upkeep or a quick lift before a session, and they show up far less because they are less central to the work a coach is actually being paid to do.
What is missing matters as much as what is present. There are no fat burners near the top, no exotic powders, nothing a coach would have to oversell. The categories that win are the boring, well-understood ones. That is what you would expect from coaches who treat their recommendation as part of a long client relationship rather than a quick upsell.
Why a third of coaches recommend nothing
The 32% who recommend no supplements at all are not a rounding error, and they are not coaches who do not care about nutrition. In the survey responses, the reasons cluster around two themes, both of them deliberate.
The first is scope of practice. Plenty of coaches draw a firm line at anything a client swallows, on the view that recommending supplements edges toward dietetic or medical advice they are not qualified to give. For them, the safer and more honest answer to "what should I take" is "ask your doctor or a dietitian first". The second is simpler: some coaches just do not think most supplements are worth the money, and would rather a client spend it on better food, sleep, and consistency than on a tub of powder. Both positions are defensible, and both show up as a flat refusal to recommend anything in the data.
For anyone choosing a coach, this is worth knowing. A coach who does not push supplements is not necessarily less invested. They may simply be staying inside their lane on purpose, which is its own kind of professionalism. The split also explains why two clients with two good coaches can get completely different supplement advice. It is not contradiction, it is two reasonable philosophies sitting side by side.
What this means if you coach clients
If you coach, the data is a quiet permission slip to decide where you stand rather than drift. Two thirds of your peers field supplement questions and answer them. A third send those questions elsewhere. Neither is wrong, but having a clear, stated position beats fumbling an answer when a client asks mid-program. Clients ask about supplements because they trust you, and a consistent reply, whatever it is, protects that trust.
It also points at where the relationship actually lives. The advice that builds loyalty rarely sits in the program itself. It sits in the check-in replies and the off-hand questions, the same place supplement chat happens. That is also where most coaches lose time when their tools are scattered. Keeping the conversation, the check-ins, and the plan in one place is half the reason coaches hold on to clients, which we dig into in our look at client retention in online coaching. The other half is asking the right things in the first place, covered in our guide to the check-in questions worth asking.
The relationship is the product. Your time is the limit.
Supplement advice, check-ins, and the back-and-forth that builds trust all take minutes that add up. Work out how many clients you can genuinely look after before quality slips.
See how many clients you can handleWhy this matters
For anyone trying to understand how health and fitness products reach the people who use them, the coach is a real and under-examined channel. A recommendation from a trusted coach carries weight a shelf label never will, and most of it happens out of view, in private messages rather than public reviews. This audit puts a number on that channel from the inside. It will not settle anyone's supplement debate, but it does show, with evidence rather than anecdote, how often the question even comes up and who tends to answer it.
It also fits a pattern we keep seeing in our own data. The work of coaching is bigger than the training plan, and it crosses borders, time zones, and topics the job description never mentioned. We mapped the geographic version of that in how global online coaching has become, and the capacity version in how many clients an online coach can realistically handle. Supplements are simply one more place the relationship shows up.
Methodology and limitations
How we got these numbers
Source. A randomised audit sample of 1,000 coaches from a voluntary QuickCoach coach survey, drawn from a platform used by more than 40,000 coaches and fitness businesses worldwide. The sample size was set in advance to hold the margin of error at roughly three percentage points at the 95% confidence level, a standard precision threshold for a survey of this kind.
Definitions. Coaches could select multiple supplement categories or indicate that they recommend none. Figures represent the share of respondents who selected each option and are not weighted or adjusted. The category ranking reflects how often each option was named, not a market share or a percentage of all clients.
Scope. This is a survey of coach-reported practice, not a nutrition or medical study. It does not collect or report client-level outcomes and is not a substitute for individual medical or nutritional advice. It is not sponsored by, and does not promote, any individual supplement brand or product.
Privacy. No individual coach is identifiable in anything published here. All figures are aggregated across the group.
Frequently asked questions
Do online coaches recommend supplements to clients?
Most do. QuickCoach platform data shows 68% of coaches recommend at least one supplement category to clients, most commonly protein, creatine, or post-workout recovery aids. The remaining 32% take a deliberate position of recommending none at all.
What supplements do personal trainers recommend most?
Among QuickCoach coaches who make a recommendation, protein and creatine come up most often, followed by post-workout recovery aids such as magnesium, omega-3, or collagen. Everyday health products and pre-workout or energy items are recommended less frequently.
Why don't some coaches recommend supplements?
Around three in ten QuickCoach coaches recommend no supplements at all, a consistent and deliberate stance rather than a gap in the data. Reasons coaches give include staying within their scope of practice and preferring clients consult a doctor or dietitian first.
Is supplement advice part of an online coach's job?
It often is, even when it is not formally part of a training plan. Clients regularly ask coaches what to eat or take, and most coaches on QuickCoach engage with that question rather than redirecting it, making supplement guidance a routine, if informal, part of the relationship.
Published June 2026. Figures are drawn from a voluntary coach survey across QuickCoach's base of 40,000+ coaches and will be refreshed as the dataset grows. For more on building the relationship behind the advice, see client retention in online coaching and how many clients an online coach can handle. Questions about the data? Reach us at support@quickcoach.fit.
