Both are valid
"Advances in the understanding of cobalamin assimilation and metabolism"
Kraus D, Yang Q, Kong D, Banks AS, Zhang L, Rodgers JT, Pirinen E, Pulinilkunnil TC, Gong F, Wang YC, Cen Y, Sauve AA, Asara JM, Peroni OD, Monia BP, Bhanot S, Alhonen L, Puigserver P, Kahn BB
Vitamin B12 plays a critical role in supporting red blood cell formation, neurological health, and DNA synthesisdeficiencies can lead to fatigue, mood changes, and cognitive decline
Unlike oral supplements, these injections bypass the digestive system and deliver B12 directly into your bloodstream, making them ideal for people with absorption issues or chronic deficiency
While B12 is readily available in animal-derived foods like shellfish, eggs, dairy products, and meats, some individuals may have difficulties absorbing it through their digestive systems