Dermatological reactions represent the most consistently documented side effect of excessive B12 intake
Another study conducted by the University of California found that B12 supplements improved energy levels and reduced fatigue in individuals with chronic fatigue syndrome

substrate for sirtuins and PARPs Redox states: Cycles between NAD+ (oxidised) and NADH (reduced) Vial size: 1000 mg Format: Lyophilized powder Studied applications Mitochondrial-function research Sirtuin-pathway studies (SIRT1, SIRT3 and related) DNA-repair mechanism and PARP-pathway research Redox biology and cellular-senescence models Reference-standard use and enzyme cofactor in assay development Quality & trust 99% HPLC purity, third-party tested Mass spectrometry identity confirmation LAL endotoxin testing on every batch Batch-specific Certificate of Analysis included COA shown in the product gallery cGMP manufactured in Dallas, Texas (USA) USA same-day shipping (orders before 2pm CT M-F) Free domestic shipping on orders over $200 Storage & handling Store refrigerated at 28C, protected from light and heat NAD+ is light-sensitive and degrades faster in solution than in lyophilized form Reconstitute with bacteriostatic water for laboratory preparation

B12 injections (lipotropic shots or lipo shots) utilize three compounds that already appear naturally within the body inositol, methionine, and choline
You should also see a clinician if you have anemia symptoms, a history of gastric surgery, suspected pernicious anemia, or if lab testing hasnt confirmed a B12 deficiency.