where should you inject vitamin b12 to B12 Shots at Home: How,

It is commonly used in laboratory settings to investigate pathways related to cellular energy regulation, NAD+ metabolism, and enzymatic activity

B Vitamins in Heart Failure It is now well accepted that patients with HF present micronutrient deficiencies owing to malabsorption resulting from splanchnic congestion, increased urinary loss of nutrients caused by diuretics largely used in HF treatment, as well as a poor oral intake at advanced stages of HF [146,147,148]

Vitamin B12 promotes the metabolism of carbs, fats, and proteins, which in turn helps relieve fatigue and provide the body with energy to function and carry out daily processes

Aging Cell 20 , e13329 (2021)