Topical UVA
Although the sunscreens or sunscreen are mostly applied topically, there are also a series of substances that act as systemic photoprotection, ie beyond the skin and act on a general level within our bodies. Also, at present, there are other substances that act as absorbing or reflecting solar radiation, but its function is to repair the damage caused by it. How many types of sunscreens can be found then? Topical sunscreens: they tend clasificarese into 4 types. Systemic photoprotection will count as six types. Topical sunscreens: organic sunscreen: They are best known because they act by absorbing the sun's radiation and convert it into another type of radiation that does not affect our skin. Chemical sunscreens are generally known and are the most traded on the market because it is easy to implement in cosmetic formulations, but are also producing further adverse reaction causing skin rashes and erythema. The chemical sunscreens are also subdivided into UVA, UVB and UVA + UVB.
The UV, of course, absorb ultraviolet radiation type A and very little of B. Cardiologist brings even more insight to the discussion. Oxybenzone is most active, using it in these products. Derivatives belong to the group of benzophenones, but there is also other substances such as anthralin, avobenzone and Mexoryl SX, in addition to absorbing short UVA radiation as does the oxybenzone, are able to absorb the entire spectrum UVA and part of UVB. As we find UVB sunscreens PABA, camphor, sulfonic acid, salicylates and octocrileno (which produces fewer adverse reactions). These substances that absorb UVB protect us against sunburn in more than 80%.
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