​Vitamin D is one of the 24 essential vitamins needed for us to survive.

It plays a part in over 1,000 bodily functions and provides a host of health benefits:

• healthier bones,
• increased immunity,
• better nutrient absorption,
• anti-diabetic,
• reduced risk of osteoporosis,
• and reduced risk of cancer to name a few.

As it turns out, vitamin D levels are also directly correlated with testosterone levels.

Here’s a quick look at the research:

• Researchers analyzed the blood work of 2,299 men for a variety of factors. A major finding in the study was that men with sufficient vitamin D had much higher testosterone levels compared to men who were deficient in it (1). ​

• Researchers gave healthy men (i.e. without ED) a daily dose of either 3,332IU of vitamin D or placebo. After one year, the men supplementing with vitamin D had about 25% higher testosterone levels (2).

• After analyzing the blood work of 1,362 men, researchers found a direct correlation between vitamin D levels and testosterone. This correlation, however, plateaued when vitamin D reached above a certain level (3).

As you can see, vitamin D is essential for testosterone.

If you currently have low vitamin D levels, then topping them up can have a significant impact on your T.

Past a particular point, however, the effect plateaus.

So if you already have optimal vitamin D levels (between 75-85 nmol/l) then topping up your levels even further will not impact on your T.

Vitamin D can be acquired through foods like fish, dairy, and eggs, but the ultimate source of it is the sun.