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Lessons in biology from patients with inborn errors of vitamin B12 metabolism

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While the body naturally makes collagen from amino acids in protein-rich foods like meat, bone broth, egg whites and spirulina, its natural quality and quantity decline with age, especially among postmenopausal women, the Cleveland Clinic says

Effects of growth hormone on glucose metabolism and insulin resistance in human

The blood-brain barrier, which is mainly composed of endothelial cells, pericytes, astrocytes and other cell types and is formed by connections between a variety of cells, is the key physiological structure connecting the blood and brain tissue and is critical for maintaining the microenvironment in the brain