hypochlorhydria only exists in alt med

"hypochlorhydria," a term used almost exclusively by alt-med and the supplement industry, is also implicated in osteoporosis and other deficiencies due to alleged subsequent poor absorption. I've even seen blood tests for "intracellular mineral deficiency" advocated to diagnose it.

However, I think you'll find scientific evidence only associated with GI conditions. I found one interesting exception: Eastell R, Vieira NE, Yergey AL, Wahner HW,Silverstein MN, Kumar R, Riggs BL. Pernicious anaemia as a risk factor for osteoporosis. Clin Sci (Lond).1992 Jun;82(6):681-5. PMID: 1320549

"...gastric acid is not required for the absorption of dietary calcium. Thus, the loss of cancellous bone must be caused by some mechanism yet to be identified."