Japan recommends tiny 360 IU Vitamin D while pregnant or lactating - 2025
The Dietary Reference Intakes for Japanese (2025): Overview and Future Directions for the Pregnant and Lactating Women's Section
J Obstet Gynaecol Res. 2026 Mar;52(3):e70236. doi: 10.1111/jog.70236.
Yoshifumi Kasuga 1, Takashi Sugiyama 2, Satoshi Sasaki 3, Keiko Asakura 4
Speculate that fewer 25% of pregnancies will get 30 ng Vitamin D level with 360 IU
Related in VitaminDWiki
- Preconception checkups being considered in Japan – recommends vitamin D above 30 ng (only 2% are above)
- Vitamin D levels in newborns are so low that they are considering supplementing to prevent Rickets (Japan)
- 20 X more likely to remember to give infant Vitamin D weekly than daily (Japan)
- Rickets in Japan increased 3 X recently, similar to increases in other countries
- Pregnancy and Vitamin D: 250 IU daily average did not help
- Vitamin D is needed while pregnant - 200 IU to 4,000 IU daily (17 clinical guidelines)
- Gave 1,000 IU of Vitamin D daily while pregnant (no surprise, no benefit) - RCT
- Preventing a Lifetime of Illness Before Birth
- Preterm birth and low Vitamin D - many studies