Vitamin D is one of the few supplements prescribed almost systematically to infants in France. This routine nature gives it a harmless image. ANSES has nevertheless published a vigilance notice calling for greater caution in how it is administered.
What ANSES reported
The agency received three reports of severe hypercalcemia in infants between 2020 and 2021. All three cases were associated with misuse of highly concentrated dietary supplements.
The products involved delivered 10,000 international units of vitamin D per drop. This dosage is designed for an adult, not for a baby just a few months old.
Signs observed in these children
The infants concerned experienced reduced appetite, vomiting, weight loss, and dehydration. Biologically, the hypercalcemia was accompanied by kidney complications, including nephrocalcinosis.
These signs are not specific and may suggest many other conditions. This is precisely what makes the connection difficult to establish without considering it.
Medicine or dietary supplement: the distinction matters
ANSES recommends prioritizing medicines over dietary supplements for vitamin supplementation in infants. The difference is not merely regulatory.
Managing the dose
A medicine has marketing authorization and a stable dosage designed for pediatric use. A dietary supplement intended for adults may contain concentrations 30 to 40 times higher than the doses expected for a baby.
The galenic form makes the problem worse. A drop remains a drop, whatever the contents of the bottle, and the difference between two products cannot be seen with the naked eye.
The agency's nutritional reference values
For infants under six months, ANSES sets the nutritional reference value at 400 IU per day, or 10 micrograms. It also sets a safety limit of 1,000 IU per day before one year of age.
These values are population reference points, not a prescription. The dose actually suited to a particular child is determined by the doctor or midwife caring for them.
ANSES's practical recommendations
The agency gives parents four simple pieces of advice. They fit into a few lines and prevent most at-risk situations.
Four rules to remember
Strictly following the conditions of use indicated by the manufacturer comes first. Next, do not use multiple sources of vitamin D, as fortified infant formula and an additional bottle may add up.
Avoid buying products online without prior medical advice as the third rule. Finally, any adverse effect should be reported promptly to a healthcare professional.
A principle that goes beyond vitamin D
This notice illustrates a useful reflex: checking what a product intended for a baby actually contains. It is the same approach applied to nutrition, as shown in our article on food diversification according to ANSES.
The same approach can also be found in our coverage of endocrine disruptors and in understanding product certifications. Regular medical follow-up, detailed in our article on the child's health schedule, remains the best framework for adjusting supplementation.
Have a question about our products or our approach? Our contact page is available to you.
Sources
ANSES, opinion concerning reports of vitamin D poisoning in infants, referral NUT2020VIG0186. ANSES, nutritional reference values for vitamin D.
