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Vitamin D is needed for human fertility – goal is 50 ng – Sept 2018

Vitamin D in human reproduction: the more, the better? An evidence-based critical appraisal.

Eur Rev Med Pharmacol Sci. 2017 Sep;21(18):4243-4251.
Laganà AS1, Vitale SG, Ban Frangež H, Vrtačnik-Bokal E, D'Anna R.
Unit of Gynecology and Obstetrics, Department of Human Pathology in Adulthood and Childhood "G. Barresi", University of Messina, Messina, Italy. antlagana at unime.it.

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OBJECTIVE:
Vitamin D is a fat-soluble secosteroid hormone that regulates calcium, magnesium, and phosphate homeostasis and plays a pivotal role as antiproliferative and immunomodulatory mediator. Considering the different sources of synthesis and dietary intake as well as the pleiotropic actions in extremely diverse (micro) environments of the body, the supplementation of this Vitamin should be carefully evaluated taking into account the several pathways that it regulates. In the current brief review, we aimed to summarize the available evidence about the topic, in order to suggest the best evidence-based supplementation strategy for human reproduction, avoiding the unuseful (and sometimes hazardous) empiric supplementation.

MATERIALS AND METHODS: Narrative overview, synthesizing the findings of literature retrieved from searches of computerized databases.

RESULTS:
Accumulating evidence from in vitro fertilization (IVF) trials suggests that fertilization rate decreases significantly with increasing levels of 25OH-D in follicular fluid; in addition, Vitamin D levels in the follicular fluid are negatively correlated to the quality of embryos and the higher values of Vitamin D are associated with lower possibility to achieve pregnancy. Both low and high Vitamin D serum concentrations decrease not only spermatozoa count, but their progressive motility as well as increase morphological abnormalities. Finally, studies in animal models found that severe hypervitaminosis D can reduce the total skeletal calcium store in embryos and may compromise the postnatal survival.

CONCLUSIONS: Based on the retrieved data, we solicit to be extremely selective in deciding for Vitamin D supplementation, since its excess may play a detrimental role in fertility.

From Conclusions

"Finally, Vitamin D should be supplemented at appropriate dosage and, according to the most updated recommendations [106], only if serum concentration falls below 50 ng/ml (equivalent to 125 nmol/L)".

Created by admin. Last Modification: Wednesday August 22, 2018 15:18:44 UTC by admin. (Version 6)

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10406 Vitamin D in human reproduction - the more, the better.pdf PDF 2018 admin 22 Aug, 2018 14:59 409.30 Kb 12
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