Matsuoka, L. Y., Wortsman, J., Hanifan, N. & Holick, M. F. (1988)
Chronic sunscreen use decreases circulating concentrations of 25-hydroxyvitamin D: a preliminary study.
Arch. Dermatol. 124:1802-1804
Designed with practicing dermatologists, dermatology trainees, physicians, and scientists interested in photoprotection in mind, this concise and highly illustrated guide provides the latest knowledge of photoprotection in dermatology and cosmetic science. Clinical Guide to Sunscreens and Photoprotectionalso addresses recent important international and domestic regulatory activity and requirements on the use of novel sun protective chemicals and proper labeling of products to ensure increased consumer awareness.This concisely written, problem-oriented text explores
See chapter by Bischoff-Ferrari et al. from page 119 dealing with what dose is needed for 25(OH)D level of 80 nmol/l in 97% of population
According to a study conducted by University of Wisconsin researchers, even people who are regularly exposed to sunlight can have low vitamin D levels.\n\nThe study focused on subjects who lived in sunny Hawaii and spent an average of 11.1 hours in the sun each week. (None of the participants in the study used any type of sunscreen.) Despite the exposure, 51 percent of participants were found to be deficient in vitamin D.
What can high-vitamin D foods do for you?
* Help prevent a growing list of chronic diseases, including type 2 diabetes, heart disease, hypertension, osteoporisis, breast cancer, colon cancer, and ovarian cancer
* Help keep your bones and teeth strong and healthy
* Regulate the growth and activity of your cells
* Reduce inflammation
What events can indicate a need for more foods rich in vitamin D?
* Bone pain and/or soft bones
* Frequent bone fractures
* Bone deformities or growth retardation in children
* Lack of exposure to sunlight for any reason, including geography, use of sunscreen, or wearing of protective clothing
Heinrich U, Neukam K, Tronnier H, Sies H, Stahl W. Long-term ingestion of high flavanol cocoa provides photoprotection against induced erythema and improves skin condition in women. J Nutr. 2006 Jun;136(6):1565-9. PMID: 16702322 [PubMed - indexed for MEDL
A clinical review paper published in the British Medical Journal is warning the public that widespread vitamin D deficiency is resurrecting the once-obsolete disease called rickets.