Kuwo wonke umlando, ubunjalo bendoda buhlotshaniswa ne-testosterone ye-hormone yakhe yabesilisa eyinhloko. Lapho eseneminyaka engaba ngu-30, amazinga e-testosterone aqala ukwehla futhi lokhu kungabangela izinguquko eziningana ezimbi empilweni yakhe yomzimba kanye nenhlalakahle: ukwehla kokusebenza kocansi, amazinga aphansi amandla, ukwehla kwemisipha kanye nokwanda kwamafutha, phakathi kokunye.
Yenza lokhu kube nokungcola okungapheli kwemvelo, ukucindezeleka kanye nokudla okungenamsoco okuvame kakhulu empilweni yethu futhi akumangazi ukuthi sibona ubhubhane lwe-testosterone ephansi kwabesilisa emhlabeni wonke.
Ngo-2013, iqembu labacwaningi baseKorea lafunda umthelela wokuchayeka kuma-testicularukukhanya kwelaser okubomvu (670nm) kanye ne-infrared (808nm).
Ososayensi bahlukanise amagundane angamaduna angama-30 abe amaqembu amathathu: iqembu lokulawula kanye namaqembu amabili ayevezwe ekukhanyeni okubomvu noma kwe-infrared. Ekupheleni kocwaningo lwezinsuku ezi-5 lapho amagundane ayevezwe khona ekwelashweni okukodwa kwemizuzu engama-30 ngosuku, iqembu lokulawula alibonanga ukwanda kwamazinga e-testosterone kanye ne-testosterone kokubili amagundane avezwe obomvu kanye ne-infrared atholakale ephakeme kakhulu:
“…Izinga le-Serum T landa kakhulu eqenjini lama-wavelength angu-808nm. Eqenjini lama-wavelength angu-670 nm, izinga le-serum T nalo landa kakhulu amazinga e-testosterone ngamandla afanayo angu-360 J/cm2/ngosuku.”