Want to put on muscle? Who wouldn’t: It keeps you strong enough to do the things you love now, and it’s a great investment for later, since muscle improves bone mineral density and mobility as you age ...

Creatine and protein are supplements that can help with health and physical fitness. Protein is best for muscle building and weight loss. Creatine can improve performance and help with recovery.

Medically reviewed by Oluseun Olufade, MD Key Takeaways There are no direct trials comparing l-glutamine to creatine for ...