People on vegan or strict plant-based diets need a reliable source from fortified foods (nutritional yeast, fortified plant milks, certain breakfast cereals) or a supplement
B12 injections provide an effective way to maintain adequate levels of this important nutrient
Allergy or hypersensitivity to cobalt or vitamin B12 2
Vitamin injections are ideal for individuals who feel fatigued, struggle with mood swings, get sick often, or have difficulty losing weight
(wada-ama.org) If youre tested in sport, this matters regardless of your intent
More aggressive cardio schedules risk muscle catabolism, fatigue, and reduced training performance