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Patients commonly report steadier energy throughout the day, fewer crashes, and better mental clarity

In higher dose supplements, that percentage drops to 1%-2%

(PubMed) Watanabe F, Bito T

43 The recommended daily allowance of vitamin B 12 is 35 g/day (2.4 g/day for adults, 1.2 g/day for children up to 8 years of age, and 2.6 g/day for pregnant women and breastfeeding mothers)

Deficiency can occur due to low dietary intake, especially in vegans, digestive problems, lack of intrinsic factor, certain medications, or age-related absorption decline

Its added to some other foods like fortified cereals and nutritional yeasts