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Sulfated Vitamin D Metabolites Represent Prominent Roles in Serum and in Breastmilk of Lactating Women

Overview
Journal Clin Nutr
Publisher Elsevier
Date 2024 Jul 18
PMID 39024772
Authors
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Abstract

Background: Concentrations of vitamin D (VitD) and 25-hydroxyvitamin D (25OHD) in breastmilk are low despite the essential role of VitD for normal infant bone development, yet additional metabolic forms of vitamin D may be present. This study evaluates the contribution of sulfated vitamin D metabolites, vitamin D-sulfate (VitD-S) and 25-hydroxyvitamin D-sulfate (25OHD-S) for lactating women and assesses the response to high-dose VitD supplementation.

Methods: Serum and breastmilk were measured before and after 28 days with 5000 IU/day VitD intake in 20 lactating women. Concentrations of VitD-S and 25OHD-S in milk, and 25OHD, 25OHD, 25OHD-S, VitD and VitD-S in serum were determined by mass spectrometry.

Results: Baseline vitamin D status was categorized as sufficient (mean ± SD serum 25OHD 69 ± 19 nmol/L), and both serum VitD and 25OHD increased following supplementation (p < 0.001). 25OHD-S was 91 ± 19 nmol/L in serum and 0.47 ± 0.09 nmol/L in breastmilk. VitD-S concentrations were 2.92 ± 0.70 nmol/L in serum and 6.4 ± 3.9 nmol/L in breastmilk. Neither sulfated metabolite significantly changed with supplementation in either serum or breastmilk.

Conclusions: Sulfated vitamin D metabolites have prominent roles for women during lactation with 25OHD-S highly abundant in serum and VitD-S distinctly abundant in breastmilk. These data support the notion that 25OHD-S and VitD-S may have physiological relevance during lactation and nutritional usage for nursing infants.

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