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Pregnant women: 2.6 micrograms (mcg) per day Breastfeeding women: 2.8 mcg per day Nonpregnant women: 2.4 mcg per day Best foods with vitamin B12 during pregnancy Vitamin B12 is only naturally found in animal products, like fish, meat, poultry, eggs, and dairy
The improvements in performance correlate with favorable changes in muscle composition and metabolic capacity
A genetic component was also suggested to interact with various environmental factors, although not yet determined [34]
How long B12 shots take to work depends on your B12 levels when you receive the injection, but you can expect to see improved energy, mental clarity, sleep, and other benefits anywhere from 12-48 hours after treatment
PMID 6769048
People with megaloblastic anemia, some gut problems, or malabsorption might need both
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