Vitamin supplements
Essential micronutrients required for hundreds of biological processes.
7 supplements in this category
Vitamin D3
Most adults are deficient. Affects 1000+ genes including immunity, mood, and bone health. Pair with K2 to direct calcium into bones, not arteries.
Dose: 1000–4000 IU daily
Vitamin K2 (MK-7)
Activates osteocalcin and matrix-Gla protein to direct calcium into bones rather than arteries. Most evidence comes from the 3-year Rotterdam study.
Dose: 100–200 mcg daily
Vitamin C
Essential antioxidant and collagen cofactor. Doesn't prevent colds but shortens duration; chronically high doses may blunt training adaptations.
Dose: 500–2000 mg daily
Vitamin E (Mixed Tocopherols)
Fat-soluble antioxidant. Always pick mixed tocopherols, not isolated alpha-tocopherol, to avoid displacing other forms in tissues.
Dose: 100–400 IU daily
Vitamin B12 (Methylcobalamin)
Active 'methylated' form of B12 that bypasses MTHFR variants. Essential for vegans, the elderly, and metformin/PPI users.
Dose: 500–1000 mcg daily
Methylfolate (5-MTHF)
Pre-methylated folate that bypasses MTHFR variants. Essential during pregnancy and for treatment-resistant depression with low folate.
Dose: 400–1000 mcg daily
Biotin (B7)
Popularly marketed for hair, skin, and nails — but evidence only supports use if frankly deficient. Stop 3 days before any thyroid test.
Dose: 1000–10000 mcg daily
All 21 comparisons in this category
Vitamin D3 vs Vitamin K2 (MK-7)Vitamin D3 vs Vitamin CVitamin D3 vs Vitamin E (Mixed Tocopherols)Vitamin D3 vs Vitamin B12 (Methylcobalamin)Vitamin D3 vs Methylfolate (5-MTHF)Vitamin D3 vs Biotin (B7)Vitamin K2 (MK-7) vs Vitamin CVitamin K2 (MK-7) vs Vitamin E (Mixed Tocopherols)Vitamin K2 (MK-7) vs Vitamin B12 (Methylcobalamin)Vitamin K2 (MK-7) vs Methylfolate (5-MTHF)Vitamin K2 (MK-7) vs Biotin (B7)Vitamin C vs Vitamin E (Mixed Tocopherols)Vitamin C vs Vitamin B12 (Methylcobalamin)Vitamin C vs Methylfolate (5-MTHF)Vitamin C vs Biotin (B7)Vitamin E (Mixed Tocopherols) vs Vitamin B12 (Methylcobalamin)Vitamin E (Mixed Tocopherols) vs Methylfolate (5-MTHF)Vitamin E (Mixed Tocopherols) vs Biotin (B7)Vitamin B12 (Methylcobalamin) vs Methylfolate (5-MTHF)Vitamin B12 (Methylcobalamin) vs Biotin (B7)Methylfolate (5-MTHF) vs Biotin (B7)