Let your data guide your decisions
Reasonable markers to track: waist circumference, weight, resting heart rate, sleep quality, and a basic liver panel (ALT, AST) before and after long cycles
Side effects may include diarrhea or headaches, and be sure to tell your doctor about these if they become bothersome
B-12 shots are a popular way to get the daily recommended amount of this vitamin, as they provide a concentrated dose that can be quickly absorbed into the bloodstream
Absorption Disorders and Gastrointestinal Conditions Many stomach and digestive problems can cause a lack of vitamin B12
(4) Heffernan MA, Thorburn AW, Fam B, Summers R, Conway-Campbell B, Waters MJ, Ng FM