Huel should not be consumed by children under 5 years old.
Although there is no reason why children over 5 could not consume Huel, they should certainly not be relying totally on Huel as the nutritional requirments are based on those of adults. I wouldn also recommend parents of children over 5 years old consult their doctor before giving their child Huel.
There are no ingredients that are unsuitable for children over 5 years old.
Let me know if you need any other advise on this issue.