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CompletedNCT01067898Updated Mar 27, 2012

A Study on Oral Vitamin D Megadoses

A Phase 4 interventional study of vitamin D3 (cholecalciferol) and olive oil in Hypovitaminosis D, sponsored by Helsinki University Central Hospital. Completed at 1 site in Finland. Open to female participants aged 70 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2012-03-27.

Sponsored by Helsinki University Central Hospital · Phase 4, Interventional, and Treatment

Phase
Phase 4
Study type
Interventional
Enrollment
60
Allocation
Randomized
Ages
70 Years and older
Sex
Female
01

Study summary

The purpose of this study is to determine if infrequent administration of oral vitamin D megadoses is effective treatment to maintain serum 25-hydroxyvitamin D(3) above target levels of 50-75 nmol/L. The investigators hypothesize that 100 000 IU or at least 200 000 IU vitamin D3 in every three months would be effective and safe treatment to achieve the target levels.

02

Conditions studied

  • Hypovitaminosis D

Keywords

  • vitamin D supplementation
  • cholecalciferol
  • PTH
  • bone turnover markers
  • elderly women
03

In context

Rickets

92 studies on the registry are indexed under Rickets; 5 are open to participants now.

This study's enrollment of 60 is above the median of 53 across 62 interventional studies indexed under Rickets.

Browse Rickets studies →

Lead sponsor

Helsinki University Central Hospital is the lead sponsor of 299 studies on the registry; 60 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
70 Years and older
Sexes eligible
Female
Accepts healthy volunteers
Yes

Inclusion criteria

  • female
  • 70-80 yrs old

Exclusion criteria

Exclusion Criteria:

  • disease or medication affecting calcium homeostasis
  • renal failure (Pt-GFRe-CG \< 35 ml/min)
05

Study design

Phase
Phase 4
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
60 participants (actual)

Study arms

  • Experimental
    200 000 IU vitamin D3 every three months

    Dietary Supplement: vitamin D3 (cholecalciferol) · Dietary Supplement: calcium carbonate

  • Experimental
    100 000 IU vitamin D3 every three months

    Dietary Supplement: vitamin D3 (cholecalciferol) · Other: olive oil · Dietary Supplement: calcium carbonate

  • Placebo comparator
    placebo every three months

    Other: olive oil · Dietary Supplement: calcium carbonate

Interventions

  • Dietary supplementvitamin D3 (cholecalciferol)

    vitamin D3 (cholecalciferol) oil 20 000 IU/ml, oral dose of 200 000 IU or 100 000 IU (10ml or 5ml) every three months for one year.

    Also known as: Vigantol vitamin D3 (cholecalciferol) oil 20 000 IU/ml

  • Otherolive oil

    10 ml (placebo group) or 5 ml (100 000 IU vitamin D3 group) oil per os every three months for one year

  • Dietary supplementcalcium carbonate

    1000 mg calcium per os every day for one year

06

What researchers measure

Primary outcomes

  1. Serum 25(OH)D3 concentration in relation to the target levels of 50-75 nmol/L

    Time frame: 12 months (including 9 time points)

Secondary outcomes

  1. Decline of creatine clearance (Pt-GFRe-CG) >20% from baseline

    Time frame: 12 months (including 9 timepoints)

  2. Hypercalciuria (dU-Ca >10 mmol/24h)

    Time frame: 12 months (including 9 timepoints)

  3. Hypercalcemia (S-Ca-ion >1,3 mmol/l)

    Time frame: 12 months (including 9 timepoints)

  4. Serum PTH

    Time frame: 12 months (including 9 timepoints)

  5. Serum PINP

    Time frame: 12 months (including 5 timepoints)

  6. Serum CTX

    Time frame: 12 months (including 5 timepoints)

07

Study locations

1 site
  • Division of Endocrinology, Department of Medicine, Helsinki University Central Hospital
    Helsinki, FI-00029 HUS, Finland
08

References and documents

Publications

  • Pekkarinen T, Valimaki VV, Aarum S, Turpeinen U, Hamalainen E, Loyttyniemi E, Valimaki MJ. The same annual dose of 292000 IU of vitamin D (cholecalciferol) on either daily or four monthly basis for elderly women: 1-year comparative study of the effects on serum 25(OH)D concentrations and renal function. Clin Endocrinol (Oxf). 2010 Apr;72(4):455-61. doi: 10.1111/j.1365-2265.2009.03637.x. Epub 2009 May 25. PubMed 19486025 ↗
  • Valimaki VV, Loyttyniemi E, Valimaki MJ. Vitamin D fortification of milk products does not resolve hypovitaminosis D in young Finnish men. Eur J Clin Nutr. 2007 Apr;61(4):493-7. doi: 10.1038/sj.ejcn.1602550. Epub 2006 Nov 29. PubMed 17136043 ↗
  • Valimaki VV, Alfthan H, Lehmuskallio E, Loyttyniemi E, Sahi T, Stenman UH, Suominen H, Valimaki MJ. Vitamin D status as a determinant of peak bone mass in young Finnish men. J Clin Endocrinol Metab. 2004 Jan;89(1):76-80. doi: 10.1210/jc.2003-030817. PubMed 14715830 ↗
09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 27, 2012, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT01067898
Lead sponsor
Helsinki University Central Hospital
Responsible party
Ville-Valtteri Välimäki (MD,PhD, Helsinki University Central Hospital) — Principal investigator
First posted
Feb 12, 2010
Start date
Feb 2010
Primary completion
May 2011
Completion
May 2011
Last update
Mar 27, 2012

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

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