One of my daughters has strong body odour when she hit puberty. She has been using Perspirex for the past 14 yrs with successful results. You have to make sure you use the right strength as it can be very strong. It is only applied every few days. You can get it on Amazon or in a drug store

Here’s some useful information. I think my son used Degree and sweat block? I forgot the brand name but the sweat block wipes were included.
https://www.verywellhealth.com/best-clinical-st...

Warm Weather is No Match For These Editor-Tested Clinical Strength Deodorants and Antiperspirants

https://www.verywellhealth.com/best-clinical-strength-deodorants-4687662

Parsley capsules, or chlorofresh in juice, if he’ll take it. Typically found at Whole Foods you can return it with the receipt if he won’t take it.

Hey, thanks for your suggestions. Unfortunately he can’t use sprays as he really doesn’t like them. I am going to take him to the doctor for the clinical deodorant but just thought I’d see if there was anything I could try first.
Thanks again ☺️

Have you tried clinical strength deodorant? I heard it’s helpful. My older son had strong B.O. when he was younger. He didn’t shower daily (every three days) his pediatrician recommended showering daily and clinical strength deodorant.