Which products contain D4 and D5?
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D4 is a residue, an impurity, and is not on the ingredient list. However, trace residues may be found in skin care products, shampoos, conditioners, and makeup products, and D4 residues may vary in different silicone oils (silicones). But it is not clear whether trace residues will cause human health problems. But the less the total, the better, just like dioxane in SLES.
For D5, do you see if there is "cyclopentadimethylsiloxane" on the ingredient list, if it is, it is it. See if they are all in the front row of the ingredients list? Yes, this product is often added more by formulators.
