It depends on your BMI, health history and how your body responds, which is why every reputable provider puts you through a clinical assessment rather than letting you pick from a menu
Its also important to note that some drugs can affect the absorption of cobalamin, including neomycin, potassium chloride, para-aminosalicylic acid, and colchicine
It also promotes healthy aging as your natural levels decline
For these individuals, vitamin B12 injections are often the most effective way to restore healthy B12 levels because they bypass the digestive system entirely, delivering the vitamin directly into the bloodstream for maximum absorption (around 95% compared to 25-50% for oral supplements)
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Regular physical activity supports the GH axis