Limited exposure to ambient ultraviolet radiation and 25-hydroxyvitamin D levels: a systematic review

Abstract

What's already known about this topic? Hypovitaminosis D is common worldwide.

Correlation of Vitamin D3 (Calcitriol) Serum Concentrations with Vitamin B12 and Folic Acid in Women Undergoing in vitro Fertilisation/Intracytoplasmatic Sperm Injection

“…Seasonal changes of D3 concentrations, for example, due to sun exposure have been verified [3,25,26]. However, this fact still often remains unconsidered, in particular, the aspect of physiological vitamin D3 storage [27].…”

“…It is widely known that D3 synthesis depends on the UVR exposure [26]. Early studies from Webb et al [25] verified that the ambient UVR in higher latitudes nonpolar regions during winter is insufficient to generate D3, showing that pre-vitamin D is not synthesized, for example, from November to February in Boston, USA (42°N) or between October and March in Edmonton, Canada (52°N).…”

A time for everything and everything in its time – exploring the mechanisms underlying seasonality of COPD exacerbations

“… 1 Variations in the mammalian reproductive cycle are among the best documented biological phenomena studied in relation to seasonality, with the level of fertility changing at certain times of the year to improve the chances of survival of offspring. 2 However, there is evidence that many other physiological functions and human disease-related conditions exhibit similar seasonal and also circadian patterns, for example, cardiovascular, 3 physiological state, 4 autoimmune, 5 cutaneous, 6 , 7 and psychiatric disorders. 8 …”

The seasonal importance of serum 25‐hydroxyvitamin D for bone mineral density in older women

“…Obviously this is not the case, and in a recent systematic review [33], it was demonstrated that many healthy adults in different populations can maintain adequate S-25OHD levels despite negligible UV exposure for several months of the year. Therefore, a key question is, how long do vitamin D stores last?…”