Vlora review for Double Effect Retinol +Collagen Serum

It doesn't say how much retinol it contains, the packaging says just 'a transformative cream with a potent concentration of retinol and collagen' but I don't think that it has a higher concentration as I couldn't see any difference or improvement in my skin. But maybe it is good product to start with retinol and then go with another product with a higher concentration of retinol. Another negative aspect is that the collagen in this product is unnecessary, because collagen in creams cannot penetrate into the skin since the molecules are to big to get into the skin.