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A method is developed for the routine analysis of dermal filler products.The method is used to identify modified hyaluronic acid and to quantify the amount of modifications and crosslinks.A product previously retrieved from the market was found to contain a high modification and crosslinking grade, which may be the reason for the high risk for adverse effects of this product.The product retrieved from the market appeared to be unreliable in its composition, regarding the modification grade and presence of a local anesthetic.There is a clear need for analytical methods to test medical devices on a routine basis as shown by the presence of suspicious and substandard products available on the market.Facial treatments with dermal fillers for medical or esthetic purposes occasionally give rise to adverse effects, ranging from temporary effects such as reddening of the skin, to long term effects such as hardening of tissue. There appears to be a relationship between the lifetime of the filler product and the risk for adverse effects. The lifetime of hyaluronic acid-based fillers is dependent on the presence and amount of crosslinking agents such as 1,4-butanediol diglycidyl ether (BDDE). It would therefore make sense to establish methodology to analyze the crosslinking grade of HA-based filler products on a routine basis. To this end, an analytical method was developed and validated to identify HA-BDDE-based fillers and to quantify their modification and crosslinking grade. The method was subsequently applied to products from the legal supply chain and the illegal market. It was found that the product Hyacorp H 1000, previously taken from the market, indeed contains a high modification grade and crosslinking grade, as was the assumed reason for the increased risk for adverse effects of this product. However, it was also shown that the Hyacorp products are highly unreliable in relation to their product composition in general. In this study, authentic products could not be distinguished from the illegal market products based on their modification and crosslinking grade.