If you supplement with Vitamin D3, you are wise, and that’s true for just about everybody. But, if you do so thinking that it eliminates your need for sun exposure, you are wrong. It has long been suspected that sunlight does more for the human body than facilitate the production of Vitamin D. And now there is some concrete evidence for that.

A new study by Georgetown Medical School researchers and published in Scientific Report discovered that sun exposure has immune-boosting effects that are independent of Vitamin D. They found that blue light specifically activates certain key immune cells and increases their motility. These cells are known as T lymphocytes. The researchers found that the blue light triggered the synthesis of hydrogen peroxide which then activated key signaling pathways that led to increased movement and motility of the T cells.

Blue light is known to reach the dermis, which is the second layer of the skin beneath the epidermis. And the dermis is loaded with T lymphocytes. These T cells can go from the dermis into the blood and get to places all over the body. So, there is a systemic effect from this, where sunlight seems to power-up your whole immune system to help you fight infection.

What does this mean from a practical standpoint? I think it means that if you’re taking Vitamin D, and even if you are taking a lot of Vitamin D, you should still get sun exposure. And this isn’t the first study to suggest sunlight benefits us outside of Vitamin D. For instance, the mood-elevating effects of sunlight are believed to be independent of Vitamin D.

When you consider the extent to which we are solar beings, that our energy, and I mean our very own physical and mental energy comes, in a straight line, from the sun’s energy which showers the Earth, and that are biological cycles, known as circadian rhythms, are timed with the solar cycle, it stands to reason that the effects of sunlight upon us would be vast and not just one thing, Vitamin D.

So, even though we can benefit from pushing the Vitamin D envelope by taking it supplementally, it does not eliminate our need for sunlight exposure.

Men have it easy. If you’re outside, working or playing or just walking, and the sun comes out and it’s warm, don’t be modest; take your shirt off. You can’t get arrested. I do it frequently. Why the heck not?

But remember: you want to avoid tanning because tanning is a sign of damage, plus tanned skin is not as receptive to the sunlight. So, this is a delicate balancing act where you want to get small amounts of sunlight often- never staying out in it long enough to provoke a tanning response.

Sunlight is one of the primary and fundamental needs of life, and unfortunately, people tend to either ignore the need for it or overdo it. With care and caution, you should make it a priority to obtain a healthful amount of sunlight- your solar food.