Alkaline Phosphatase

Differential Diagnosis:

• Elevated ALP with normal GGT → likely bone origin (common in athletes with heavy resistance training)
• Elevated ALP with elevated GGT → likely liver origin — investigate with full liver panel
• Isolated ALP elevation → consider vitamin D deficiency, hyperparathyroidism, or bone healing

Supplements:

• Vitamin D3 -- 5000 IU/day (deficiency causes compensatory ALP elevation from bone turnover)
• Vitamin K2 (MK-7) -- 100-200mcg/day (supports proper calcium metabolism and bone health)
• Zinc -- 30mg/day (cofactor for ALP enzyme function)

Lifestyle:

• If liver-origin: follow ALT/AST management (NAC, TUDCA, reduce hepatotoxic compounds)
• If bone-origin: generally benign in athletes — ensure adequate calcium (1000mg/day) and vitamin D
• Avoid blood draw within 48h of heavy leg/back training (bone-loading exercise can transiently elevate)

References:

• Holick, M. F. (2007). Vitamin D deficiency. New England Journal of Medicine, 357(3), 266-281. DOI: 10.1056/NEJMra070553
• Prasad, A. S., Mantzoros, C. S., Beck, F. W. J., Hess, J. W., & Brewer, G. J. (1996). Zinc status and serum testosterone levels of healthy adults. Nutrition, 12(5), 344-348. DOI: 10.1016/S0899-9007(96)80058-X
• Institute of Medicine. (2011). Dietary reference intakes for calcium and vitamin D (A. C. Ross, C. L. Taylor, A. L. Yaktine, & H. B. Del Valle, Eds.). National Academies Press. DOI: 10.17226/13050