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Long-term data beyond 12 weeks in humans does not exist from controlled trials
The reason it shows up in longevity blends is decline
Vitamin B12 injections are significantly more expensive than oral supplements when accounting for the full cost of treatment including office visits, injection fees, and ongoing maintenance appointments
Evidence reviews for risk factors and symptoms and signs for vitamin B12 deficiency: Vitamin B12 deficiency in over 16s: diagnosis and management: Evidence review B
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