BOOST Testosterone Naturally! Why High Testosterone & Low Cortisol Predicts Your Success at Work

5 Sept 2025 · 12 min
11:56

A Y Combinator study of 107 male founders found testosterone rises through early funding rounds then drops 42% in late-stage companies. Harvard research shows the most successful leaders combine high testosterone with low cortisol. Dr. Ann explains why and covers diet, sleep, exercise, and testing to optimize both.

Questions this video answers

107 male founders.

A reported 42% drop in late-stage (Series B/C).

High testosterone combined with low cortisol.

Total and free testosterone; salivary cortisol (morning and evening); thyroid function tests; vitamin D; B vitamins; zinc.

At least 7 hours per night; she states ~80% of testosterone is formed during sleep.

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