There has been no consensus on the optimal level of vitamin D intake to reduce PTH, and this is why many laboratories report the normal range of vitamin D to be so wide (20 to 40 ng/ml ...
prompting calls for people to follow healthy vitamin D level ... Cystic Fibrosis Patients Can Benefit from Vitamin Supplements, Research Shows Sep. 29, 2022 — Cystic fibrosis patients who ...