Can anyone suggest the dosage of S AdenosylMethionine in children???

Hope this helps:

Before taking s-adenosylmethionine, talk to your doctor, pharmacist, or health care professional if you have any other medical conditions, allergies, or if you take other medicines or other herbal/health supplements. S-adenosylmethionine may not be recommended in some situations.

Expand this post...

Talk to your doctor before taking s-adenosylmethionine if you are taking anti-depressant medications. Do not stop or adjust your dose of anti-depressant medication without first talking to your doctor.
Do not take s-adenosylmethionine without first talking to your doctor if you are pregnant or could become pregnant. Do not take s-adenosylmethionine without first talking to your doctor if you are breast-feeding a baby. There is no information available regarding the use of s-adenosylmethionine by children. Do not give any herbal/health supplement to a child without first talking to the child's doctor.
Read more at http://www.drugs.com/mtm/s-adenosylmethionine.html#0oDvv5kmmD1GmPGb.99