^{*The figures below are based on aggregated, anonymised internal patient data from men prescribed testosterone therapy following clinician assessment. They reflect average observed changes over the first month of treatment. Individual responses vary, and not everyone will experience the same results.}

^{**Based on the most up-to-date prices of the top 6 private clinics offering testosterone services in the UK.}

1. ^{Araujo AB, Esche GR, Kupelian V, O’Donnell AB, Travison TG, Williams RE, et al. Prevalence of symptomatic androgen deficiency in men. The journal of clinical endocrinology and metabolism. 2007;92(11): 4241–4247.}

2. ^{Internal Numan data}

3. ^{Dandona P, Dhindsa S, Ghanim H, Saad F. Mechanisms underlying the metabolic actions of testosterone in humans: A narrative review. Diabetes Obes Metab. 2021;23(1):18–28.}

4. ^{El-Osta A, Liu VN, Huang D, Foster J, Johnson H, Alaa A, et al. A cross-sectional survey of experiences and outcomes of using testosterone replacement therapy in UK men. Translational andrology and urology. 2025;14(5): 1295–1307}

5. ^{Barbonetti A, D’Andrea S, Francavilla S. Testosterone replacement therapy. Andrology. 2020;8(6): 1551–1566.}

6. ^{Sizar O, Leslie SW, Schwartz J. Male hypogonadism. In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2025.}

^{7. Ohlander SJ, Varghese B, Pastuszak AW. Erythrocytosis following testosterone therapy. Sex Med Rev. 2018;6(1):77-85.}

^{8. Crosnoe LE, Grober E, Ohl D, Kim ED. Exogenous testosterone: a preventable cause of male infertility. Transl Androl Urol. 2013;2(2):106-13.}

^{9. Hackett G, Kirby M, Rees RW, Jones TH, Muneer A, Livingston M, et al. The British Society for Sexual Medicine guidelines on male adult testosterone deficiency, with statements for practice. World J Mens Health. 2023;41(3):508-37.}