Taurine
An amino acid mentioned as a 'longevity vitamin' and for mitochondrial health, but not primarily used for direct performance enhancement by Dr. Galpin's team.
Videos Mentioning Taurine

Dr. Andy Galpin: The Optimal Diet, Supplement, & Recovery Protocol for Peak Performance
FoundMyFitness
An amino acid mentioned as a 'longevity vitamin' and for mitochondrial health, but not primarily used for direct performance enhancement by Dr. Galpin's team.

Beta-Alanine, Training Frequency, and Strength for Hypertrophy (Episode 59)
Stronger By Science
An amino acid that sometimes has concerns about competitive inhibition with beta-alanine, but recent research alleviated these concerns at typical dosing.

How to Improve Skin Health & Appearance
Andrew Huberman
An amino acid suggested by Dr. Andrea Suarez as playing a critical role in skin's nutritional health.

Q&A: Bands, Chains, Useful Supplements, and Tweaking Your Program (Episode 27)
Stronger By Science
An antioxidant for the brain and testes. May help preserve brain and testicular function in those with inflammatory lifestyles (e.g., heavy drinking, smoking) and may increase testosterone in middle-aged males.