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Serum B12 levels may therefore serve as a marker of hepatic injury, with higher levels sometimes correlating with disease severity

If your fundamentals are not in place, no peptide will compensate

National Library of Medicine (US), MedlinePlus

Molecular and Cellular Endocrinology

Make sure to include these in your meals for adequate levels of vitamin D and B12: High in B12: Beef liver Shellfish (e.g., clams and crab) Salmon and tuna Ground beef Dairy products such as milk, yogurt, and cheese Fortified plant-based milk or cereals High in Vitamin D: Salmon Freshwater trout Sardines Mushrooms exposed to sunlight Fortified milk and cereals When to See a Doctor If you experience persistent symptoms of deficiency or are unsure about your nutrient needs, consult a healthcare provider