I have a hard time believing that an ounce of a serum could really be worth this much money, but I tried it anyway. It does a very nice job with sensitivity relief when skin is irritated. I use tretinoin, which can sometimes irritate my skin; this helps in those cases to calm the irritation. It's also quite hydrating. I've not yet experienced any long-term benefits ... I was hoping to see a reduction in crepiness in my neck, since that's usually influenced by hydration (usually I can reduce it with a good hyaluronic acid serum), and this does help to some degree, but not as much as I'd hoped. For the price, I'm not sure it lives up to significant effectiveness any more than other moisturizing serums, but it's definitely good. Value for money isn't there for me ... at least not that I'm experiencing yet.

I have been using Vasco-Tonic serum for years and it has worked PERFECTLY to minimize and hide red veins and red marks on my face. With this new formula, the veins and marks are ALL coming back! Yes, Vasco-Tonic was watery, but it worked! Unfortunately, for my skin type, adding all these moisturizers and oils creates an oil slick on my face when paired with my other GM Collins skin care and it seems to be keeping the actual reason for using this product from working. This is not a one size fits all product and I really would like to have the choice of continuing to use the original Vasco-Tonic, which actually worked for me.

I have been loving this serum! It is the perfect consistency - creamy but lightweight and layers well with other products. I have actually been applying this before my Tretinoin, and it has really helped keep my skin calm without inhibiting the effectiveness of the Tretinoin. It is a little pricey, but I have had such good experiences with this brand that I think I’ll likely reorder when I run out. My skin looks more youthful and dewy after a few weeks of consistent use.

Just started using and it is lovely on my sensitive skin. I love all my GM products.

The GM COLLIN Advanced Serum is a great option for anyone dealing with sensitive or redness-prone skin. It has a lightweight texture that absorbs quickly without feeling greasy, and it layers nicely under moisturizer or makeup. After consistent use, skin feels calmer and looks more even, especially in areas that tend to flush easily.What stands out most is how soothing it feels on application—no irritation or heaviness, which can be hard to find with targeted treatments. It works well as part of a daily skincare routine and pairs nicely with other gentle products. Overall, it’s a high-quality serum that delivers visible calming benefits while staying kind to sensitive skin.