If you're concerned, you can get your bloods done for around £100 AFAIK.
Test boosters are an industry rife with snake oil. Be careful. The best things for testosterone are generally just things that are good for life. Good sleep, low stress, not too much booze, balanced diet.
The gym I go to has a blood can come and test people. Can’t think why. So may give it a go. It seems mad that there isn’t a hrt for men. When some of the effects of low testosterone are quite serious.
Anyone ever worry about their testosterone levels. I’m hurtling towards 40 and understand levels start to drop.