I have only used this oil a couple times but so far, it hasn't caused any allergic reactions or had any unpleasant side effects. I have very sensitive skin so finding products that don't make Hives flare up or make my skin red and blotchy is a difficult task. This oil is thick and kind of has a "wet" feeling when being rubbed in. It spreads nicely but requires a good amount of rubbing to be fully absorbed. It has absolutely no smell that I can detect. I also applied some to a scar on my husband's arm last night. I didn't look at it this morning to see whether it helped any overnight but we'll probably apply it again tonight. Oh, I am using this product in conjunction with Vit C Oil, Rosehip Oil, and Evening Primrose Oil for stretch marks and deep lines across my neck and collarbone area. I have stretch marks from my second pregnancy and have used Strivectin SD for awhile but wanted to try something more holistic and natural...not to mention, cheaper!! So far, my skin is very smooth and supple. My stretch marks seem less prominent and my neck skin is nice and tight. I intend to try these products with my dermaroller and will update my review with the results after awhile