Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Biotin (B7) | Vitamin K2 (MK-7) | |
|---|---|---|
| Category | Vitamins | Vitamins |
| Standard Dose | 2500-5000 mcg daily | 100-200 mcg MK-7 daily |
| Timing | With meals. Any time of day. | With fat-containing meal alongside Vitamin D3. |
| Cycle Duration | ongoing for maintenance; 3-6 months for hair/nail cosmetic benefit | ongoing (mandatory co-supplement with Vitamin D3) |
| Evidence Level | moderate_human | strong_human |
Biotin serves as a covalently bound coenzyme for five mammalian carboxylase enzymes: acetyl-CoA carboxylase (fatty acid synthesis), pyruvate carboxylase (gluconeogenesis), propionyl-CoA carboxylase (odd-chain fatty acid and amino acid metabolism), 3-methylcrotonyl-CoA carboxylase (leucine catabolism), and methylcrotonyl-CoA carboxylase. It also plays a role in histone biotinylation (epigenetic regulation), gene expression regulation, and cell signaling. Essential for keratin infrastructure in hair, skin, and nails.
2500-5000 mcg daily
With meals. Any time of day.
ongoing for maintenance; 3-6 months for hair/nail cosmetic benefit
Vitamin K2 (menaquinone-7) activates vitamin K-dependent proteins via gamma-carboxylation of glutamic acid residues. Key targets: osteocalcin (directs calcium into bone matrix), matrix Gla protein (MGP, inhibits arterial calcification), Gas6 (cell signaling, neuroprotection), and protein S (anticoagulant). MK-7 has a long half-life (~72 hours vs 1-2 hours for K1) enabling consistent carboxylation activity with once-daily dosing. It works synergistically with Vitamin D3 to regulate calcium metabolism — D3 increases calcium absorption while K2 directs its deposition.
100-200 mcg MK-7 daily
With fat-containing meal alongside Vitamin D3.
ongoing (mandatory co-supplement with Vitamin D3)
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