Vitamin D plays a very important role in our life. If you're someone who's into fitness, this should be a crucial part of your diet. The daily intake of vitamin D should be between 400IU-600IU. There are many food sources available.
This also plays a significant role in men's life, since vitamin D increases testosterone level in our body.
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there are some positive correlations to that, but no clear mechanism. so, it's not wise to make such definitive claims.
I'm not saying there will be a significant increase in testosterone levels by taking vitamin D, but you'll notice some increase in your energy levels. That's what I observed by taking vitamin D.