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It may be offered through some longevity, hormone, or functional medicine clinics, depending on current regulations, though access has become more restricted because of FDA safety concerns around compounding
Low B12 levels are common, especially in people with restrictive diets, certain medical conditions, or high stress levels
[Abstract]2025 Nov 25;44(11):116502
Archived from the original on 18 June 2025
The randomized withdrawal evidence compares continued 2.4 mg with stopping
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