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The direct evidence in humans is not yet there, as clinical trials are needed
Taking vitamins orally or relying on your digestive system to absorb all of the vitamins is not as effective as injections because a certain percentage of the vitamins will be lost through the digestive process and expelled as waste
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The Bottom Line Vitamin B12 can lift energy and mood, especially if you have a deficiency
Ling Q, Herstine JA, Bradbury A et al (2023) AAV-based in vivo gene therapy for neurological disorders
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