The three common deficiencies that decrease mental focus are hypothyroidism, low testosterone and estrogen, and progesterone and testosterone imbalance. Proper hormone levels are vital for optimal brain function and healthy neurotransmitter levels. The effects of hormones on cognitive function are being studied more closely by the medical community. A recent study even shows correlations between estrogen levels and the incidence of Alzheimer’s disease. Estradiol in particular appears to have a potent neuroprotective, antioxidant effect, preventing our neurons from oxidative damage and early death. It makes perfect sense that as hormone levels shift in both men and women, age, memory and attention may decline. Managing those extreme swings can keep you mentally sharp. If your experiencing poor concentration and brain fog it may be your hormones. BHRT could be your answer.