Testosterone is essential to male health, regulating energy, muscle mass, mood, cognitive function, and reproductive health. It's the hormone that defines masculine vitality.
Yet emerging science reveals a troubling trend: testosterone levels in men have been declining for decades, with environmental factors increasingly implicated as a primary cause.
AVERAGE TESTOSTERONE LEVELS (ng/dL)
THE EVIDENCE
Multiple peer-reviewed studies have documented this decline. Research published in the Journal of Clinical Endocrinology & Metabolism found that average testosterone levels in American men dropped by roughly 1% per year between 1987 and 2004.
A 2020 meta-analysis confirmed these findings, showing the trend has continued and potentially accelerated in recent years.
Source: Travison et al., Journal of Clinical Endocrinology & Metabolism, 2007; NHANES data 2006-2019
Dr Shanna Helen Swan, The Guardian, March 2021"PEOPLE ARE RECOGNISING WE HAVE A REPRODUCTIVE HEALTH CRISIS... I AM NOT SAYING OTHER FACTORS AREN'T INVOLVED. BUT, I AM SAYING CHEMICALS PLAY A MAJOR CAUSAL ROLE."
Endocrine-disrupting chemicals (EDCs) are found in countless everyday products: plastics, personal care items, cleaning supplies, and food packaging. These chemicals can interfere with our hormonal systems, and research increasingly links them to declining testosterone levels and other reproductive health issues.
At TEST, we believe you shouldn't have to choose between effective products and your long-term health. That's why every product we make is formulated without EDCs and other harmful chemicals.