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Some people notice improved energy or less tingling within days, but meaningful relief of numbness or burning from neuropathy can take several weeks to months

Without enough glucose, you can feel lethargic

Biotin may also aid in the growth and strengthening of hair

Early symptoms may include tiredness, reduced energy levels, weakness and difficulty concentrating

When You Might Need Higher B12 Doses While the standard RNI of 1.5 mcg per day suffices for most healthy adults, certain medical conditions, dietary patterns, and medications can substantially increase B12 requirements or impair absorption, necessitating higher therapeutic doses under medical supervision