Uv penetration vitamin d

A little about the video
Show notes Beauty Science News 3D printing comes to cosmetics! Question of the week: What kind of vitamin C works best on skin? Illdiko from Hungary asks.. I really love vitamin C serums, but I would like to use them properly.
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Which kind of vitamin C is best for skin? Episode 31

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Aquarium & Pond UV Sterilization | How UV-C Sterilizers Work

Vitamin D From Sun Exposure Over many centuries of human history, the shift from a hunter-gatherer to an agricultural-based to an industrialized society also meant less vitamin D from sun exposure. Ancient civilizations all developed in areas of the world that were subtropical in climate and that made living outdoors year-round a possibility. Until modern times, human beings have always spent a great deal of time outdoors. But as the human race migrated from subtropical to less temperate climates, this has changed dramatically. Avoiding sun exposure has lead to widespread vitamin D deficiencies. Whenever tests are done to measure vitamin D levels in numerous subjects, the results show that the population as a whole is suffering from chronic vitamin D deficiency. These numbers are probably reflective of most of the population.
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Ultraviolet radiation

T and activates phosphodiesterase PDE. This results in a reduced influx of sodium and calcium cations to photoreceptors. Therefore, the closure of cGMP-gated channels leads to the hyperpolarization of photoreceptor plasma membrane, which, in turn, results in an inhibition of synaptic secretion of glutamate - a neurotransmitter signalling absorption of photons to the secondary neurons in the retina.
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In the "test tube", antioxidants negate the effects of the light, and the light negates the effects of oxidants. In some sense, this may be like the light is an antioxidant. Other reasoning indicates it helps by being a slight pro-oxidant in the same way exercise helps: I focus on CCO, but a paper discusses the possible important role of other compounds although I completely disagree with this paper's uncited wave-of-hand dismissal of combining wavelengths:
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