The RF Research Team scours the latest peer-reviewed studies so you don't have to. No opinions. No bro science. Just what the research actually proves.
Testosterone
The internet says fasting increases testosterone by 180%. Some studies say the opposite. We reviewed 6 peer-reviewed studies to find out what the research actually proves.
Testosterone
Most men optimizing testosterone skip zinc entirely. That's a mistake — the research on what deficiency actually does to your hormones is some of the most direct evidence in men's health.
Testosterone
One drink won't tank your testosterone. But the research on chronic drinking, binge drinking, and even moderate regular consumption tells a more complex story than most men realize.
Cold Exposure
Cold exposure is everywhere right now. Influencers swear it raises testosterone. Some studies suggest the opposite. Here's what the peer-reviewed research actually shows about cold water immersion, hormones, and what it's actually good for.
Testosterone
Cortisol and testosterone operate on a seesaw. When one goes up, the other tends to go down. Here's what 5 peer-reviewed studies reveal about chronic stress, the HPA-HPG axis, and what you can actually do about it.
Vitamin D
Vitamin D is the one micronutrient with a direct receptor in testicular cells. Here's what 5 studies show about the relationship between deficiency and testosterone — and what actually happens when you fix it.
Creatine
Over 500 peer-reviewed studies. Decades of research. More data than almost any other supplement in existence. Here's what creatine actually does — and what the studies say about testosterone, DHT, hair loss, and performance.
Testosterone
You already know bad sleep makes you feel terrible. But the research shows it's doing something more specific — and more damaging — to your hormones than most men realize.