Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| Alpha Lipoic Acid (ALA) | Biotin (B7) | |
|---|---|---|
| Category | Supplements | Vitamins |
| Standard Dose | 300-600mg R-ALA daily | 2500-5000 mcg daily |
| Timing | On empty stomach, 30-60 min before meals. Split doses for higher amounts. | With meals. Any time of day. |
| Cycle Duration | ongoing or cycle 12 weeks on, 4 weeks off | ongoing for maintenance; 3-6 months for hair/nail cosmetic benefit |
| Evidence Level | strong_human | moderate_human |
ALA is a dithiol compound that functions as a cofactor for mitochondrial alpha-keto acid dehydrogenases (pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase). Both ALA and its reduced form DHLA are potent antioxidants capable of regenerating other antioxidants including vitamin C, vitamin E, and glutathione. ALA activates AMPK, improving glucose uptake via GLUT4 translocation, and modulates NF-kB-mediated inflammatory signaling. It chelates redox-active metals (Fe2+, Cu2+).
300-600mg R-ALA daily
On empty stomach, 30-60 min before meals. Split doses for higher amounts.
ongoing or cycle 12 weeks on, 4 weeks off
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
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