Diethylene Glycol Monoethyl Ether (DGME) is present in this formula. The EU SCCS has classified DGME as a Category 5 skin penetration enhancer and it is currently under ongoing safety review. It is permitted in both India and the EU at present levels, but the regulatory concern is that DGME increases the transdermal absorption of every other ingredient it is co-formulated with — effectively raising systemic exposure to all actives in the serum. No fragrance, no azo dyes.

The brand states 10% Ascorbyl Glucoside, and the Vitamin C + Vitamin E combination is well-established in antioxidant research — the two vitamins work synergistically. Sodium Hyaluronate adds hydration. Ascorbyl Glucoside is a gentler, more stable form of Vitamin C than L-Ascorbic Acid, which is an advantage in India's heat but comes with lower potency. This distinction is not communicated in the product name. DGME enhances ingredient penetration, which may boost efficacy but also increases the systemic absorption of all co-formulated ingredients.

The brand states 10% Vitamin C on the product, which is a welcome transparency. The full INCI is published on dotandkey.com and DGME is listed within it. However, the penetration-enhancing properties of DGME are not explained to consumers, so buyers have no way of knowing that this ingredient increases their systemic exposure to everything else in the formula. The product name implies L-Ascorbic Acid to most consumers, but the actual form used is Ascorbyl Glucoside — a distinction that matters for anyone comparing efficacy against other Vitamin C serums.

No synthetic fragrance, no azo dyes. Dot & Key is an Indian brand and is not sold in markets requiring mandatory animal testing for imported cosmetics. Packaging is plastic. RSPO certification for palm-derived ingredients has not been independently verified. DGME is a synthetic penetration enhancer currently under regulatory review with no positive ethics certifications to offset it.