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The OK Daily Study

27 mei 2026 bijgewerkt door: Norfolk and Norwich University Hospitals NHS Foundation Trust

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.

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.

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

The OK Daily Study is a multi-centre study taking place in the Norfolk and Norwich University Hospital, Norwich, UK, and Ashford and St Peters' Hospital, Chertsey, UK.

Infants born at ≥37 weeks' gestation will be recruited in the participating site if they meet eligibility criteria and are born within the recruitment window. Recruitment will take place before the mother and infant are discharged from the hospital following birth.

The two main arms of this study are breastfeeding and formula feeding. Mother and infant pairs will initially be allocated based on the family's feeding preferences.

Infants in the breastfeeding arm will be randomised into group 1 or group 2 in a 2:1 ratio. Group 1 allocation will be blinded; group 2 allocation will be open label.

  • Group 1 - infant supplementation group. Infants will receive either 45 micrograms/day of MK-7 with 10 micrograms/day vitamin D3 or a placebo consisting of 10 micrograms/day vitamin D3
  • Group 2 - maternal supplementation group. Mothers in this group will receive 2 mg/day MK-7. All breastfeeding infants in this group will receive 10 micrograms/day of vitamin D3.

Formula fed infants will be in group 3 and will not require any additional supplementation as part of this study. This is because infant formula is already supplemented with adequate amounts of vitamin K1 and vitamin D.

All supplements will be started within 7 days of birth. Vitamin D drops are included for breastfed infants as per national UK guidelines.

Follow up will be as follows:

  • 1 month postnatal visit (range 1-1.5 months) - phone call.

    o Confirmation of eligibility to continue, assessment of compliance with the intervention, and to schedule the in person follow up visit

  • 2 months postnatal (range 2-3 months) - in person visit.

    • All babies will have a single blood sample taken.
    • Mothers who are in group 2 (mothers who have had MK-7 supplementation) and a selection of mothers from group 1 (breastfeeding mothers who are not supplemented with MK-7) will have a single blood sample taken and will be asked to provide a single breastmilk sample
    • Mothers will be asked about their opinions on practising the supplementation.

Blood samples will be analysed for vitamin K status, including Proteins Induced by Vitamin K Absence/antagonism of prothrombin (PIVKA-II) and of osteocalcin (undercarboxylated osteocalcin), dephosphorylated-undercarboxylated matrix gla-protein (dp-ucMGP) and serum vitamin K concentrations (including of vitamin K1 and MK-7). Breastmilk samples will be analysed for vitamin K concentrations (including vitamin K1 and MK-7)

Once this in person follow up visit has been completed, the mother and baby pair will have completed the study.

Studietype

Ingrijpend

Inschrijving (Geschat)

134

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

Studie Contact Back-up

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Kind

Accepteert gezonde vrijwilligers

Ja

Beschrijving

Inclusion Criteria:

  • Infants, and mothers of infants, born ≥37 weeks gestational age
  • Standard dose of intramuscular (IM) vitamin K prophylaxis given to the neonate following birth
  • For breastfeeding mothers: the mother intends to exclusively/predominantly breastfeed their baby for at least 2 months

Exclusion Criteria:

  • Inability or refusal to provide informed consent
  • Inability to adhere to or comply with study procedures
  • Babies who meet the inclusion gestation but would otherwise, as part of routine neonatal care, be provided with daily vitamin K drops (i.e. NeoKay drops) at discharge
  • IM vitamin K prophylaxis not received at birth (parents declined vitamin K prophylaxis or parents chose for neonate to receive an oral course of vitamin K prophylaxis instead)
  • Evidence of conjugated hyperbilirubinaemia (these babies are at higher risk of VKDB)
  • Mothers, and babies born to mothers, who are taking any medication that could affect or antagonise vitamin K metabolism (i.e. warfarin, the anti-epileptic drugs phenytoin or carbamazepine, and cephalosporin, rifampicin and isoniazid antimicrobials)

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Preventie
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Enkel

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Ander: Mother and infant pairs who are breastfeeding.

Group 1 = infant supplementation group. Infants in this group will be randomised to receive either 6 drops a day containing 45 micrograms/day of MK-7 plus 10 micrograms/day vitamin D3 OR 10 micrograms/day vitamin D3 only (the active placebo, containing no vitamin K)

Group 2 = maternal supplementation group. Mothers in this group will be given 2 mg/day MK-7 capsules. Infants in this group will receive 10 micrograms/day vitamin D3.
Ander: Combined MK-7 + vitamin D3 drops
6 drops/day providing 45 micrograms/day MK-7 plus 10 micrograms/day of vitamin D3
Andere namen:
  • Vitamin K2 supplemented infant group
Ander: Vitamin D3 Drops
6 drops/day providing 10 micrograms/day vitamin D3 and no supplementary MK-7.
Andere namen:
  • Vitamin K2 unsupplemented group
Ander: MK-7 capsules
1 mg capsules of menaquinone-7, with a daily dose of 2 mg (i.e. 2 capsules per day)
Actieve vergelijker: Formula Feeding Infants
Infants who are exclusively formula feeding. These infants will receive the recommended daily amount of vitamin K through their formula milk intake and so will not receive any additional vitamin K supplementation.
Ander: Vitamin D3 Drops
6 drops/day providing 10 micrograms/day vitamin D3 and no supplementary MK-7.
Andere namen:
  • Vitamin K2 unsupplemented group

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Comparison of the proportion of participants who have a PIVKA-II >0.05 AU/mL in the unsupplemented and supplemented infants.
Tijdsspanne: 2 months postnatal age (range 2-3 months).

PIVKA-II = protein induced by vitamin K antagonism/absence; clotting protein II.

Measured via serum blood sample in arbitrary units/mL. For the primary outcome, this is the comparison between the supplemented and unsupplemented infants.
2 months postnatal age (range 2-3 months).

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Comparison of the proportion of participants who have a PIVKA-II >0.05 AU/mL in the various study groups.
Tijdsspanne: 2 months postnatal age (range 2-3 months).

PIVKA-II = protein induced by vitamin K antagonism/absence; clotting protein II.

Measured via serum blood sample in arbitrary units/mL. For secondary outcome, this is comparison between remaining groups, other than those assessed in the primary outcome measure.
2 months postnatal age (range 2-3 months).
Comparison of serum levels of osteocalcin (undercarboxylated and carboxylated) between the study groups.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Both undercarboxylated and carboxylated levels of osteocalcin will be measured in nanograms/mL.
2 months postnatal age (range 2-3 months).
Comparison of the percentage of undercarboxylated osteocalcin as a proportion of total osteocalcin (%GluOC) between the study groups.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Total osteocalcin calculated by the sum of the undercarboxylated and carboxylated osteocalcin values.
2 months postnatal age (range 2-3 months).
Comparison of serum levels of dephosphorylated undercarboxylated matrix Gla Protein in included participants between the study groups.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Measured in picomol/mL
2 months postnatal age (range 2-3 months).
Comparison of levels of serum K vitamers (including, but no limited to, vitamin K1 and menaquinone-7) between the study groups.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Serum K vitamers will be reported in micrograms/mL.
2 months postnatal age (range 2-3 months).
Comparison of the levels of breastmilk K vitamers (including, but not limited to, vitamin K1 and menaquinone-7) between unsupplemented and supplemented mothers.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Serum K vitamers will be reported in nanograms/mL
2 months postnatal age (range 2-3 months).
Investigation of percentage compliance to study supplementation.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Amount of remaining supplement will be assessed at follow up. This will then be used to calculate percentage compliance by comparing it to the expected volumes.
2 months postnatal age (range 2-3 months).
Investigation regarding families' opinions about infant and maternal vitamin supplementation.
Tijdsspanne: 2 months postnatal age (range 2-3 months).
Measured via verbal questioning at follow up.
2 months postnatal age (range 2-3 months).

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Norfolk and Norwich University Hospitals NHS Foundation Trust

Medewerkers

Guy's and St Thomas' NHS Foundation Trust
University of East Anglia
Maastricht University
Ashford and St. Peter's Hospitals NHS Trust

Onderzoekers

  • Hoofdonderzoeker: Paul Clarke, Professor, Norfolk and Norwich University Hospitals Nhs Foundation Trust

Publicaties en nuttige links

De persoon die verantwoordelijk is voor het invoeren van informatie over het onderzoek stelt deze publicaties vrijwillig ter beschikking. Dit kan gaan over alles wat met het onderzoek te maken heeft.

Algemene publicaties

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

1 augustus 2026

Primaire voltooiing (Geschat)

1 september 2027

Studie voltooiing (Geschat)

1 augustus 2028

Studieregistratiedata

Eerst ingediend

13 mei 2026

Eerst ingediend dat voldeed aan de QC-criteria

27 mei 2026

Eerst geplaatst (Werkelijk)

2 juni 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

2 juni 2026

Laatste update ingediend die voldeed aan QC-criteria

27 mei 2026

Laatst geverifieerd

1 mei 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 150-12-25

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

Deze informatie is zonder wijzigingen rechtstreeks van de website clinicaltrials.gov gehaald. Als u verzoeken heeft om uw onderzoeksgegevens te wijzigen, te verwijderen of bij te werken, neem dan contact op met register@clinicaltrials.gov. Zodra er een wijziging wordt doorgevoerd op clinicaltrials.gov, wordt deze ook automatisch bijgewerkt op onze website .

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