l carnitina mas cafeina L-Carnitina con Cafeína, Té Verde y Guaraná Suplemento Alimenticio BDM – Juveternal Carnitina y Cafeína 60 Cápsulas
Description
References Abdelrazik H, Sharma R, Mahfouz R, Agarwal A.2009

2020 Dec;13(6):65

Smoking is associated with free radical production resulting in high levels of DNA damage in human sperm and can affect the integrity of sperm DNA, which might result in increased incidences of childhood cancer in the offspring

I have been using it off and on through the year
For liquid forms, you can mix the recommended dosage into your dogs food or water
