A similar question was asked here months ago:
AFAA Supplement Policy:
Holding an AFAA Personal Training Certification, AFAA has a Supplement Policy which should be read.
I work in a facility that recently brought on board a supplement line which I do not actively participate in the selling of those products.
With thousands of supplements available, some clients will ask about a product they are currently taking or think about taking.
I simply quiz them on why they think they need supplementation and make sure they thoroughly read all the ingredients and let them decide for themselves.
I Hope This Helps!