What did @scottyoptimal actually say?
In a ranked-list format, @scottyoptimal assigned common symptoms to either high or low testosterone. Some of his claims were surprisingly reasonable. Others were stated with a certainty that no endocrinologist would co-sign. He said things like "you cannot have high testosterone and be depressed" and "I can guarantee you your testosterone is not optimal" if your body fat exceeds 15-20%. Those are the kinds of absolute statements that tend to fall apart under scrutiny.
He also flagged morning wood, grip strength, fast muscle growth, sharp focus, and risk-taking as high-T indicators, while flagging fatigue, brain fog, low libido, depression, gynecomastia, and muscle loss as low-T signs. The framework isn't invented, but the execution is sloppy in places that actually matter to men trying to understand their health.
Does the science back this up?
Partially, yes. The symptoms he lists are genuinely associated with hypogonadism in clinical literature. But association is not the same as causation, and that distinction matters enormously here.
Testosterone does influence libido, muscle mass, mood, and cognition. A 2019 review by Rastrelli and Maggi in Best Practice and Research Clinical Endocrinology and Metabolism confirmed that low testosterone correlates with reduced libido, fatigue, and depressive symptoms in men with diagnosed hypogonadism. The Testosterone Trials (Snyder et al., 2016, NEJM) also found modest but real improvements in sexual function and mood with testosterone therapy in older hypogonadal men. So the symptom list isn't fabricated.
Where he goes wrong is in treating these symptoms as testosterone-specific. Fatigue, depression, brain fog, and low libido have dozens of causes: sleep apnea, thyroid dysfunction, anemia, cardiovascular disease, mental health conditions, medication side effects. A symptom checklist from an Instagram video is not a diagnostic tool.
What did they get wrong (or right)?
Let's be direct about the worst offenders first.
- "You cannot have high testosterone and be depressed." This is flatly wrong. Depression is a complex neurobiological condition. Men with normal or even elevated testosterone develop depression. A 2022 meta-analysis by Zarrouf et al. in Journal of Psychiatric Research found testosterone had modest antidepressant effects in some hypogonadal men, but the relationship is bidirectional and not deterministic. Telling a depressed man his testosterone must be low is not just inaccurate, it could delay proper mental health treatment.
- Body fat over 15-20% as a testosterone guarantee. The relationship between adiposity and testosterone is real. Aromatase enzyme activity in fat tissue does convert testosterone to estrogen (Vermeulen et al., 1996, Journal of Clinical Endocrinology and Metabolism). But "15-20%" as a hard cutoff where he can "guarantee" low testosterone is invented precision. Plenty of men carry 22% body fat with testosterone in the normal range.
- What he got right: Morning erections as a proxy for nocturnal testosterone production is clinically reasonable. Grip strength correlating with anabolic hormone status has legitimate research behind it (Leong et al., 2015, Lancet). Loss of muscle despite training being a red flag is also defensible. He deserves credit for those.
What should you actually know?
Symptoms alone cannot diagnose low testosterone. The Endocrine Society's clinical practice guidelines are clear: a diagnosis of hypogonadism requires at least two early morning serum testosterone measurements below the normal range, combined with symptoms. One without the other is insufficient.
The normal range for total testosterone in adult men is roughly 300-1000 ng/dL depending on the lab, with free testosterone being an equally important metric. Men with testosterone at the low end of normal can still be symptomatic. Men with genuinely low levels can sometimes feel fine. The symptom picture is suggestive, not definitive.
If you recognize several of these symptoms, the right move is a blood panel ordered by a licensed provider, not a paid DM community. A basic panel should include total and free testosterone, LH, FSH, SHBG, prolactin, and a metabolic panel to rule out other causes. That workup tells you something. A video ranking system tells you very little.
The creator is selling access to a paid community. That context should be part of how you weigh his confidence in these symptom lists.