What are the Functions of Skin Absorption?
Skin absorption, also known as percutaneous absorption or dermal absorption, is the process by which substances move from the outside environment, through the skin, and into the bloodstream. This isn't a primary function of the skin; its main job is to act as a barrier. However, some substances can penetrate this barrier.
The skin's ability to absorb substances serves several important functions:
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Nutrient Absorption: The skin can absorb certain vitamins, such as vitamin D, after exposure to ultraviolet (UV) sunlight. The UV radiation triggers a series of chemical reactions in the skin that lead to vitamin D synthesis. Enhance Me Training Academy
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Medication Delivery: Many topical medications, like hydrocortisone cream, are designed for skin absorption. This allows for localized treatment of skin conditions. [Reference 17-Sept-2020]
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Gas Exchange: The skin facilitates the absorption of gases, such as oxygen and carbon dioxide, though this is less significant compared to the lungs.
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Environmental Exposure: Unfortunately, skin absorption also allows harmful substances to enter the body. This is a significant concern in occupational settings where exposure to chemicals is a risk. NIOSH | CDC Exposure to urban particulate pollution can also impact skin barrier function and subsequent drug absorption. PubMed
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Other Substances: The skin can absorb a wide range of other substances, though the extent of absorption varies greatly depending on the substance's properties and the skin's condition.
The Skin's Barrier Function
It's crucial to remember that the skin's primary function is to act as a barrier, preventing the absorption of most exogenous substances. The amount of absorption is usually minimal. ScienceDirect This barrier function is essential for protecting the body from harmful environmental factors.
