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If supplementation is responsible, your doctor may recommend reducing or stopping non-essential B12 intake, with repeat testing after an appropriate interval (typically 2-3 months, or longer if you've had recent injections or have kidney disease)
However, there are many commonly known signs of this vitamin deficiency you should be on the lookout for
PMID: 31121843
When you lack B12, your red blood cells become malformed, and the oxygen delivery is compromised, making you feel tired
Q4: Are there side effects
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