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A 2023 study found that vitamin B12 deficiency is associated with higher body weight and fat mass, according to Healthline
Most people feel a lift after a B12 shot, but a minority feel briefly worse
G., Lovric, E.,
If your syringe has half-unit markings, 0.3mL is exactly 30.0 units
Price: 35
Sleep improves, recovery improves, body composition shifts, and then somewhere past the two or three month mark the benefits flatten
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