It’s actually a function of the HPA axis called a neuro endocrine response. It’s not so much HEAVY weights as you put it as much as it is as difficult workout as you can stand to do. Most people lift “moderate or regular” as you’ve put it. Mostly for the mental fell good that they’ve “worked out”. But workouts are supposed to push you to what would feel like death. Simulating a hunt or being hunted that is life threatening. This with consistency yields the most natural testosterone production.
AndroGel ® (testosterone gel) 1% and % are controlled substances, available by prescription, used to treat adult males who have low or no testosterone due to certain medical conditions. It is not known if AndroGel is safe or effective to treat men who have low testosterone due to aging . It is not known if AndroGel is safe or effective in children younger than 18 years old . Testosterone products that are applied to the skin may have different doses, strengths, or application instructions that may lead to different levels of testosterone in your body .
It does work, however, I get pimples starting at about 3 weeks in to the regime. Could be because I am still a young lad. Who knows. I would not say they make the world of difference, but for me it is worth it. I would for you however, suggest just getting in shape first. (No offence intended) Get your training AND nutrition dialed if you feel you want that small edge, go for it. I personally just returned to the gym about few months ago. I waited until most of my initial strength gains slowed, and I also waited until I dropped a bunch of body fat. At high levels of BF, you will be seeing lower testosterone anyway… Why not get in shape first and maximize the benefits of all your training and nutrition