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Far more Vitamin D in breast milk from a 150,000 IU dose than from daily 5,000 IU – RCT May 2018

Comparison of the effect of daily versus bolus dose maternal vitamin D3 supplementation on the 24,25-dihydroxyvitamin D3 to 25-hydroxyvitamin D3 ratio

Bone, Volume 110, May 2018, Pages 321-325, https://doi.org/10.1016/j.bone.2018.02.024
Hemamalini Kethaab 1, Tom D.Thacher c Sara S.Oberhelman c, Philip R. Fischer d, Ravinder J.Singh e, Rajiv Kumar abf


Comment by Henry Lahore, founder of VitaminDWiki

  • Bodies have been evolved to store vitamin D (not require daily sunshine)
  • Many studies have found non-daily dosing of Vitamin D to acually produce better results than daily
  • Intermittant dosing (up to 17 days) appears to provide the most benefit, but monthly dosing is OK
  • Take vitamin D3 daily or weekly has the following chart
    see wikipage: http://www.vitamindwiki.com/tiki-index.php?page_id=2475
    Note: This chart unrealistically assumes 100% daily compliance
    Assuming a 80% daily compliance, the first column would be 20% shorter


  • The women started with non-typical high levels of Vitamin D: 29 ng
  • Mayo trial started in 2010 and ended in 2011
  • Took till 2018 for these results to be published


 Download the PDF from Sci-Hub PDF from VitaminDWiki

Note: None of the daily dosing resulted in high levels of Vitamin D in breast milk
Daily dose = black triangles. solid line    Single dose = open circle, dotted line
Vitamin D in blood (Calciferol) - which goes to breast milk
Calcidiol - which goes to placenta


  • Bolus high-dose vitamin D produced more 24,25(OH)2D than daily supplementation.
  • After bolus vitamin D, the increase in 24,25(OH)2D lagged behind that of 25(OH)D.
  • Daily vitamin D may increase 25(OH)D more effectively than larger bolus dosing.

Supplementing lactating mothers with high doses of vitamin D3 can adequately meet vitamin D requirements of the breastfed infant. We compared the effect of bolus versus daily vitamin D3 dosing in lactating mothers on vitamin D3 catabolism. We hypothesized that catabolism of 25(OH)D3 to 24,25(OH)2D3 would be greater in the bolus than in the daily dose group.

Design, setting and patients: Randomized controlled trial (clinicaltrials.gov NCT01240265_ in 40 lactating women.

Interventions: Subjects were randomized to receive vitamin D3 orally, either a single dose of 150,000 IU or 5000 IU daily for 28 days.
Vitamin D metabolites were measured in serum and breast milk at baseline, 1, 3, 7, 14 and 28 days.

Main outcome measure: Temporal changes in the serum 24,25(OH)2D3/25(OH)D3 ratio.

The concentration of serum 24,25(OH)2D3 was directly related to that of 25(OH)D in both groups (r2 = 0.63; p < 0.001). The mean (±SD) 24,25(OH)2D3/25(OH)D3 ratio remained lower at all time points than baseline values in the daily dose group (0.093 ± 0.024, 0.084 ± 0.025, 0.083 ± 0.024, 0.080 ± 0.020, 0.081 ± 0.023, 0.083 ± 0.018 at baseline, 1, 3, 7, 14, and 28 days, respectively). In the single dose group, the increase in 24,25(OH)2D3 lagged behind that of 25(OH)D, but the 24,25(OH)2D3/25(OH)D3 values (0.098 ± 0.032, 0.067 ± 0.019, 0.081 ± 0.017, 0.092 ± 0.024, 0.103 ± 0.020, 0.106 ± 0.024, respectively) exceeded baseline values at 14 and 28 days and were greater than the daily dose group at 14 and 28 days (p = 0.003). The 24,25(OH)2D3/25(OH)D3 ratio remained in the normal range with both dosing regimens. Greater breast milk vitamin D3 values in the single dose group were inversely associated with the 24,25(OH)2D3/25(OH)D3 ratio (r2 = 0.14, p < 0.001), but not with daily dosing.

After a 14-day lag, a single high dose of vitamin D led to greater production of 24,25(OH)2D3, presumably via induction of the 24-hydroxylase enzyme (CYP24A1), relative to the 25(OH)D3 value than did daily vitamin D supplementation, and this effect persisted for at least 28 days after vitamin D administration. A daily dose of vitamin D may have more lasting effectiveness in increasing 25(OH)D3 with lesser diversion of 25(OH)D3 to 24,25(OH)2D3 than does larger bolus dosing.

Created by admin. Last Modification: Wednesday February 3, 2021 16:29:19 GMT-0000 by admin. (Version 10)

Attached files

ID Name Comment Uploaded Size Downloads
9567 Chole vs days.jpg admin 21 Mar, 2018 11:37 12.60 Kb 732
9566 25 vs days.jpg admin 21 Mar, 2018 11:37 12.81 Kb 666
9565 Bolus equals circles.jpg admin 21 Mar, 2018 10:47 17.48 Kb 772
9564 Bolus daily.pdf PDF 2018 admin 21 Mar, 2018 10:37 747.28 Kb 656