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Serious Indicators of Vitamin B-12 Deficiency Severe vitamin B12 deficiency can cause signs and symptoms such as Yellow skin Weak muscles Numb or tingly hands or feet Trouble walking Severe joint pain Increasing shortness of breath Weight loss Irritability Lack of smell and taste sensations Memory loss Paranoia Delusions Deep depression What Does B12 Fatigue Feel Like

2020 Feb 9;9(2):474

Expecting immediate results Quitting after 2 weeks because the scale hasn't moved is premature

The compounds effects on NAD+ metabolism may have implications for muscle biology given the importance of NAD+-dependent enzymes in muscle function