This is a thread to consolidate knowledge on common fitness and strength training supplements based on the best research I have seen over the past few years. I will divide them into four classes: Class A - generally accepted as effective and little potential for harm, Class B - questionable effectiveness and little potential for harm, Class C - generally accepted as effective but possible harm, Class D - questionable effectiveness and possible harm, Class E - believed to be harmful. Class A - Whey Protein - Creatine - Vitamin D, E, C (assuming deficiency) - Fiber supplement - Omega 3, fish oil Class B - Glutamine - Arginine - Lysine - Beta alanine - Multivitamin - Conjugated Linoleic Acid (CLA) - Alpha lipoic acid (ALA) - L-Carnitine L-Tartrate (LCLT) - Chromium Piccolinate - Green Tea Extract (EGCG) - CoQ10 - Glucosamine Class C - caffeine - HGH Class D - DHEA - testosterone boosters/precursors - Fat Burners (in general) Class E - ephedra Note: List has been modified to reflect forum member input. Disclaimer: This list represents personal opinion based on review of available scientific evidence and opinion alone where no studies are available. All supplements should be used with caution and have the potential for harm if used inappropriately, in excessive doses or without regard to preexisting illness or medication interactions. Discuss with your physician before starting any supplement regimen. This is intended for reference only and is not intended as a guide for anyone starting a supplement regimen.