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Focus on products providing 400-600 calories per serving with 25-50 grams of high-quality protein, complex carbohydrates, healthy fats, and minimal artificial additives

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Some of them are very niche

Vitamin B12 deficient individuals , a surprisingly common category.7 Methylfolate-deficient individuals , whether due to genetics, diet, or lifestyle

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The NAD + -consuming enzymes produce NAM as a byproduct, of which high concentrations inhibit the activity of NAD + -consuming enzymes, providing feedback regulation