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Heres what Id do if I were you: Ask your doctor to test for these genetic variants (you might have to push for this) Use those results to figure out if you need more B12 than the standard dose Track your B12 and homocysteine levels monthly for three months to see if its working Adjust as needed based on how you actually feel When Your Cells Just Wont Cooperate Even when you bypass your gut completely with shots, your cells still need help getting that B12 inside where it can do its job

Here's our RD-approved roundup of the nine best BCAA supplements of 2025

When using these products, start with lower concentrations to minimize skin irritation

Wiley, Chichester, pp 159189 Beisel KG, Jahnke S, Hofmann D et al (2010) Continuous turnover of carotenes and chlorophyll a in mature leaves of Arabidopsis thaliana revealed by 14CO2 pulse-chase labeling