can vitamin b12 injections cause weight gain When Should You Get a Injection? B12 Injections for Weight Loss:

However, they do not always address energy levels, nutrient absorption, or muscle preservation

Fatigue and lethargy Clinical trials recorded fatigue as an occasional adverse event

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The speed at which you experience a pick-me-up after a B12 injection can vary depending on a few factors: The Severity of Your Deficiency If you have a mild deficiency, you might feel a difference in energy levels within a few days to a week