In this post I mentioned that I would provide an update on the above Vitamin C derivatives from The Ordinary. The Ordinary's Ethylated Ascorbic Acid 15% Solution takes too long to absorb into my skin so I won't repurchase. I'm really happy with the Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F because it sinks in quickly without any greasiness. I've been using it in the evenings on top of my face serums. I normally follow up with E45 Cream to keep my dry, eczema prone skin moisturised.