Vitamin D Supplementation: A Review of the Evidence Arguing for a Daily Dose of 2000 International Units (50 µg) of Vitamin D for Adults in the General Population
Pludowski P, Grant WB, Karras SN, Zittermann A, Pilz S (2024) Nutrients 16(3) 391. doi: 10.3390/nu16030391.
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Abstract:
Vitamin D deficiency is considered a public health problem due to its worldwide high prevalence and adverse clinical consequences regarding musculoskeletal health. In addition, vitamin D may also be crucial for the prevention of certain extraskeletal diseases.Despite decades of intensive scientific research, several knowledge gaps remain regarding the precise definition of vitamin D deficiency and sufficiency, the health benefits of improving vitamin D status, and the required vitamin D intakes.
Consequently, various societies and expert groups have released heterogeneous recommendations on the dosages for vitamin D supplementation. In this brief narrative review, we outline and discuss recent advances regarding the scientific evidence arguing for a daily vitamin D supplementation with 2000 international units (IU) (50 µg) of vitamin D3 to prevent and treat vitamin D deficiency.
According to data from randomized controlled trials (RCTs), such a dose may improve some health outcomes and is sufficient to raise and maintain serum 25(OH)D concentrations above 50 nmol/L (20 ng/mL) and above 75 nmol/L (30 ng/mL) in >99% and >90% of the general adult population, respectively.
According to large vitamin D RCTs, there are no significant safety concerns in supplementing such a dose for several years, even in individuals with an already sufficient vitamin D status at baseline.
A daily vitamin D supplementation with 2000 IU (50 µg) may be considered a simple, effective, and safe dosage to prevent and treat vitamin D deficiency in the adult general population.
FAB RESEARCH COMMENT:
Vitamin D deficiencies and insufficienies are widespread in the general population - and associated with a very wide range of both physical and mental health conditions. Abundant scientific research has also provided clear mechanistic evidence of the critical role Vitamin D plays in both body and brain development and function.Of course, 'correlation is not causation', and RCT evidence for supplementation in many areas has been mixed - not least owing to the numerous ethical and practical problems involved in designing and conducting effective trials.
This new review makes a strong case - based on good evidence from randomised controlled trials (RCT) - to support a population-level recommendation for Vitamin D supplementation in adults at 2000 IU / day.
With respect to mental health in adults, a recent systematic review of RCTs found benefits for depression, but only at doses of 1600 IU or more. See
Given the EU's Upper Safe Limit for Vitamin D intake in adults is 4000 IU / day, it is hard to understand why public health authorities continue to make such ineffectively low recommendations - e.g. the UK goverment only suggests that people might simply 'consider' just 400IU in autumn and winter. By contrast, the evidence reviewed here shows that 5 x more than this is supported by good clinical trial evidence.
Of course, the most vulnerable groups are those least likely to supplement at all - hence a fortification program with targeted supplementation (as adopted in Finland) makes most sense. But raising current recommendations would be a good start.
For more information on this subject, see:
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