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Hyaluronic acid is the most common natural filler. Hyaluronic acid is also known as extracellular matrix. It is a gel-like material which is found normally in the body and is the consistency of a thick gel. In the past hyaluronic acids have been of animal origin. However, today most hyaluronic acids on the market are genetically engineered. The infection risk and the cross-reactivity is almost zero.
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