RESEARCHERS from the universities of Oxford and Southampton in the UK looked at 64 multivitamins and found only 25%-36% provided the correct dose of 400 IU, BBC News reports.
The Royal College of Paediatrics and Child Health (RCPCH) said the research was "highly concerning" and products were "misleading parents".
They recommend checking the dosage on the labelling of supplements.
The researchers looked at multivitamins and vitamin D supplements marketed at children aged under 12 and sold at Asda, Morrisons, Ocado, Sainsbury's, Tesco, Boots, Holland and Barrett, Lloyds Pharmacy and Superdrug and found:
Vitamin D in the UK is important to prevent children from suffering with rickets, which affects bone growth and can lead to deformities.
The main source of vitamin D is sunshine but it is hard to get enough in the UK in autumn and winter.
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