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We have shown previously (6-8) that this is also true for the urinary excretion of two collagen breakdown products, galactosyl hydroxylysine (Gal-Hyl)  and deoxypyridinoline (DPD).
Urinary galactosyl hydroxylysine increases with aging and might be a useful marker in patients with osteoporosis.
Clinical performance of galactosyl hydroxylysine, pyridinoline, and deoxypyridinoline in postmenopausal osteoporosis.