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B12 is obtained exclusively from animal-derived foods (meat, fish, dairy, eggs) or fortified products, making vegans and vegetarians particularly vulnerable to deficiency

For individuals who often feel fatigued or lethargic, these injections can provide a much-needed boost

Vitamin B12 deficiency has occurred in breast-fed infants of vegetarian mothers whose diets contain no animal products (e.g., eggs, dairy), even though the mothers had no symptoms of deficiency at the time

The consequences extend beyond simple fatigue: B12 deficiency can trigger mood disturbances, cognitive decline, nerve damage, and compromised immune function