NR-Testosterone is used in Marina Zacharias’ Protocol for Undescended Testicles.

This protocol can be started as young as 5 weeks in lines with a known problem of retaining testicles.
Dosage:

All:
     Testes Complex 1 dropper 3x day,
     Testosterone 1 dropper 1 x day
Small Dogs:
     Symplex M 1at 2x day
Medium & Large Dogs:
    Symplex M 2-3 at 2x day