Definition improves modestly, especially if you're lean enough to see changes
However, vitamin B12 does not provide these benefits in people who get enough B12 from their diet
(2003) Randomized, placebo-controlled trial of intramuscular vitamin B12 for the treatment of hyperhomocysteinaemia in dialysis patients
Asghar, F., Shamim, N., Farooque, U., Sheikh, H., & Aqeel, R
Boosts Mood, Memory & Cognitive Function Regular injections may help alleviate mood swings, brain fog, and cognitive decline, supporting overall mental wellness
NAD+-Sirtuin2 reduces chronic low-grade inflammation and enhances the quantity and functionality of MuSCs