Finally a high concentration of the Granactive retinoid that I've been looking for. I'd tried The Ordinary 5% Granactive Retinoid but when I found this one on-line and read a little further. This has double the concentration of the active so in equivalent terms would be 10% Granactive. Having used the other retinoid ester products, the yellow colour is actually a good sign. It's how it should be. As for the smell, it's medical but not unpleasant. I just use a little anyways so I don't smell it at all during typical use. I feel like my skinn looks refreshed and no irritation so can use every day.