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most other claimed benefits (bone density, body composition) trace back to animal studies or preliminary/anecdotal reports, not confirmed human efficacy trials

For any serious researcher, understanding this distinction isn't just helpfulit's absolutely critical for designing valid, targeted, and reproducible studies

These claims are not supported by robust clinical evidence in healthy adults, and no large-scale human trials have validated this combination

Ansoleaga, B

In the UK, a private B12 injection will typically set you back between 30 and 70 per shot , depending on where you are and the type of clinic you visit