Where the trainer's guidance ends
First, the ethical and legal line: prescribing individualized diet and supplementation is the nutritionist's job (CFN). A trainer can give general evidence-based guidance and, most importantly, refer clients to the right professional. The content below is educational information about the most studied supplements — not a prescription. Individual cases → nutritionist/doctor.
The 4 with the most evidence
Creatine
The most studied and safest supplement in sports. Improves strength, power, and muscle gain, with possible cognitive benefits. Monohydrate form, usual dose of ~3-5g/day, taken continuously. No "loading phase" or cycling needed. Safe for long-term use in healthy individuals.
Whey protein
It's not magic — it's convenience. It's high-quality protein to help you hit your daily target when food alone isn't enough. If you're already hitting your protein goal through diet, you don't need it.
Caffeine
Proven ergogenic: improves focus, perceived exertion, and performance. ~3-6mg/kg before training. Watch for individual sensitivity, sleep impact, and hypertension.
Beta-alanine
Helps with medium-duration efforts (~1-4 min) by buffering muscle acidity. Modest effect, dose ~3-5g/day. The tingling (paresthesia) is harmless.
Supplements are the tip of the pyramid. Without consistent training, sleep, and nutrition, they won't fix anything.
What trainers CAN do
- Provide general guidance on safe, evidence-backed supplements.
- Reinforce the importance of protein, hydration, and consistency.
- Refer to a nutritionist for an individualized protocol.
What trainers should NOT do
- Prescribing individualized doses and protocols (that's a dietitian's job).
- Recommending compounded drugs, aggressive "fat burners," or anything with a miracle-cure promise.
- Selling supplements creates a conflict of interest with your coaching advice.
The factor that decides the outcome: consistency
Even the right supplement only works if your client takes it every day — and that's where most people fail. Here's how digital reminders boost adherence.
How Trainer Connect helps
- Reminders: help the client stay consistent with recommended supplementation.
- Built-in referrals: log guidance and the connection with the partner nutritionist.
- Tracking: cross-reference adherence with strength and body composition progress.