Renew Level 4 Vitamin A Serum

I used this pretty steady for quite some time and I thought it was a pretty good product which did as promised. Results were much slower than with a retinol (say A-Pasioni or a script), yet also...

FYI: Skip the next paragraph if you’re in a hurry. I settled on retinaldehyde (retinal) as my retinoid of choice after reading a number of peer-reviewed articles. At low concentrations (0.05%...