Children can consume supplements from the age that they can swallow and not choke. Another option for those that are capsules is to open and mix it with the food according to the flavor.
Once the child can swallow, the dosage can be adjusted to its need, for example, if the child is small you are going to give him/her one fourth of the dose, open the capsule and add it to a meal.
1/4 or 1/3 of an adult's dose
Warning: Check the ingredients according to the supplement to be taken to avoid the consumption of any allergen.