Giloy is not a food product.
You are willing to give preservatives added giloy juice not fresh juice from stem or fresh kadha prepared from fresh giloy stem.
First diagnose your son prakruti sarta by ayurvediy way then decide about medicine for immunity not blindly way.
Next Steps
take online consultation directly providing all the details
Health Tips
https://www.quora.com/Can-I-consume-Giloy-Amla-juice-every-morning-and-before-bed/answer/Gajanan-Manamwar