
Related Articles

Brand Investigation
Brand Investigation A grade
Life Extension
Life Extension's paradox: quality-control muscle, request-only proof, and a cleaned-up regulatory trail
Life Extension

Supplement Guide
Supplement Guide Robust evidence
Calcium
In 1808, a young Humphry Davy hooked his new battery to a paste of "lime," boiled off the mercury, and—against all expectations—pulled a silvery metal from...
Calcium

Supplement Guide
Supplement Guide Robust evidence
Iron
In 19th-century clinics, pale teenagers were diagnosed with "green sickness," a languor so common it earned its own pills—iron salts that often turned the...
Iron

Synergy
Synergy Promising evidence
The Immune Vision Duo: Unlock What's Stuck
Context-dependent synergy: proven in deficiency settings (especially for persistent diarrhea and pregnancy night blindness), but additive or null elsewhere.
Vitamin A

Best For

Synergy
Synergy Promising evidence
NAC + Glycine (GlyNAC): Rebuilding Glutathione Together
Promising dual-precursor combo that raises/normalizes glutathione and improves multiple markers in certain human trials—but true synergy (A+B vs A or B) isn't...
Cysteine
