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In fact, according to the National Institutes of Health, nearly 1 in 5 adults over 60 and up to 15% of the general population are estimated to be deficient in vitamin B12

Results vary by individual

The National Institutes of Health shares the following recommended dietary allowances (RDAs) in micrograms (mcg) when it comes to vitamin B12: Teens and adults more than 14 years old: 2.4 mcg Pregnant women: 2.6 mcg Breastfeeding women: 2.8 mcg Food is also a great source of nutritional goodness, and many people are able to fulfill all of their B12 needs through diet alone

Psychological symptoms You often have mood changes