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Vitamin B12 deficiency is a common condition, although hypersensitivity reaction against vitamin B12 is rare

Fatigue, lethargy, low mood, shortness of breath, and nerve problems can all be symptoms of vitamin B12, or folate, deficiency

Retinoids and acids work primarily through exfoliation

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"People who really believe that that's the power of placebo." B12 has me like —@katyperry As a geriatrician at Mount Sinai Hospital in Toronto, Sinha said he commonly tests for B12 levels in patients "when we're assessing a person for dementia or a person with balance issues." Otherwise he said it's ineffective to take B12 supplements to prevent deficiency and there are even potential risks of over-doing it