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Vitamin B12 is normally obtained by consuming foods from animal sources

A blood test is the most reliable way to confirm whether B12 deficiency is a contributing factor

Learn more about how vitamin D deficiency can also impact the nervous system

Mild side effects: Itching, swelling, dizziness, or headache may occur but are typically temporary

Aging increases the risks of metabolic diseases (including obesity and diabetes), cardiovascular disease, and Alzheimers disease

For weight loss, though, its key advantage is metabolic flexibility : it helps the body switch to burning fat stores and may reduce insulin resistance, attacking one root cause of weight gain