Testosterone replacement and hormone optimization practice at 7301 Girard Ave, Suite 301, La Jolla, CA 92037, on the third floor of the MedTek Building at the north end of La Jolla Village's main commercial corridor. Suite 301 shares the MedTek Building with CortexRx Wellness Pharmacy (Suite 100), an independent compounder that formulates the custom hormone preparations integrative practices like this one prescribe. Led by Dr. Michael Nielsen — a Wake Forest University School of Medicine honors graduate, former Marine flight surgeon with a combat action ribbon and 2003 Flight Surgeon of the Year designation, and UCSD chief resident — the practice focuses exclusively on male hormone optimization through medically supervised TRT protocols including injections, gels, patches, and pellets. Also an attending physician at the La Jolla VA Hospital and assistant clinical professor at UCSD. Google rating: 5.0 across 5 reviews. Open Monday through Friday 9 am–4 pm. La Jolla's other hormone-focused provider, Hormones + Wellness by SDBotox at 7710 Fay Ave, casts a wider net — bioidentical HRT for both men and women, plus aesthetic services — where Optimal Health narrows its scope to male endocrinology.