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The OK Daily Study
Sponsor: Norfolk and Norwich University Hospitals NHS Foundation Trust
Summary
The OK Daily Study is a multi-centred, part-randomised, part blinded, four cohort study. We are exploring daily dietary supplementation with vitamin K2, specifically menaquinone-7 (MK-7), given to breastfed infants or breastfeeding mothers to see whether this improves the incidence of biochemical vitamin K deficiency in the infants at 2 months postnatal age. The overall aims are: * To compare infant MK-7 supplementation with placebo * To compare maternal MK-7 supplementation with placebo * To compare infant MK-7 supplementation and maternal MK-7 supplementation * To compare infant MK-7 supplementation with vitamin K1 supplementation via infant formula milk. Once recruited, mother and infant pairs will be grouped initially based on the families' feeding choice. Breastfed infants will then be randomised 2:1 to the infant supplementation or maternal supplementation group. Within the infant supplementation group, infants will either receive MK-7 with vitamin D or a placebo containing vitamin D. Follow up will occur at 2 months postnatal age (range 2-3 months postnatal age), where bloods and breastmilk samples will be collected to assess the infant and maternal vitamin K status.
Official title: Oral Vitamin K2 (Menaquinone-7; MK-7) Supplementation and Effect on Vitamin K Status of Breastfed Term Infants in Early Infancy; a Four-cohort Prospective, Part-randomised, Part-blinded Study.
Key Details
Gender
All
Age Range
Any - 7 Days
Study Type
INTERVENTIONAL
Enrollment
134
Start Date
2026-08-01
Completion Date
2028-08-01
Last Updated
2026-06-02
Healthy Volunteers
Yes
Interventions
Combined MK-7 + vitamin D3 drops
6 drops/day providing 45 micrograms/day MK-7 plus 10 micrograms/day of vitamin D3
Vitamin D3 Drops
6 drops/day providing 10 micrograms/day vitamin D3 and no supplementary MK-7.
MK-7 capsules
1 mg capsules of menaquinone-7, with a daily dose of 2 mg (i.e. 2 capsules per day)