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For many patients, oral B12 is enough

pharmacies will dispense it only with a valid prescription from a licensed healthcare provider

Regarding absorption , it's worth noting that crystalline B12 found in supplements is already in free form and does not require separation from food proteins by stomach acid, unlike B12 naturally present in food

Over-the-Counter Availability: Many oral B12 supplements are available over the counter, making them easily accessible

From a pharmacokinetic perspective , limited evidence exists directly comparing how these two forms behave in the body

Testosterone propionate: ~2 days (much shorter ester)