Vitamin D is a fat-soluble vitamin that is naturally present in fatty fish, beef liver, cheese and egg yolks. Vitamin D is nicknamed the “sunshine vitamin” because our bodies are capable of producing it when our skin is exposed to UVB rays from the sun.
The human body must have vitamin D to absorb calcium and maintain adequate levels of phosphorus in the blood. Vitamin D also plays an essential role in muscle function and the immune system. Vitamin D deficiency has been linked to breast cancer, colon cancer, prostate cancer, heart disease, depression, weight gain and other maladies.
LowVitamin D DirectlyLinked To Lower Testosterone Levels
Nowadays, a large portion of the population has very little exposure to sunlight, resulting in low or deficient levels of vitamin D.
Clinical studies suggest that increasing vitamin D intake may increase testosterone and improve other related health measures, such as sperm quality. One study found a close correlation between vitamin D deficiency and low testosterone. When participants spent more time in the sun and their vitamin D levels increased, so did their testosterone levels [15]. In a year-long study, men who were given 3,300 IU of vitamin D every day saw their blood serum levels of vitamin D double and their testosterone levels increased by 20% [16].
The tolerable upper limit of vitamin D is 4000IU per day, meaning that you can safely supplement with up to 4000IU per day without experiencing any adverse side effects.