I have tried a lot of serums.  This does a nice job of helping with SOME mattifying- it definitely doesn’t keep my combo skin from being shiny but does help reduce it.  It doesn’t dry out the rest of my skin (the non-T-zone).  I have been buying this repeatedly 

A wise Dermatologist once told me "if you live in a humid environment you must wear Vit C," she also highly recommended Jan Marini C-Esta. Not only does it smell delicious, it works wonderfully. It helps uplift the skin, and I even apply it behind my ears. My face gets oily, but I have found 2 products that keep it at bay: This Jan Marini C-esta oil control and the Jan Marini (tinted) physical protectant. I have a subscription to both products.

My dermatologist recommended this product. I have used it every morning for over 8 years and find that I still love it. It sinks into my skin quickly and I move on to the rest of my makeup routine. I have recommended it to all of my friends!

Among all the VC products I've tried, this one has the best texture. Really good for oily combination skin.

I love all of Jan Marini products. I usually purchase the regular C-Esta Face Serum but decided to try this one that is oil control. It did a great job at keeping my face less shiny during the day. I still use the other serum at night and use this one during the day.

this goes on easily and sinks in immediately and leaves no greasy shine! love it!plus i know i am doing something great to my skin!an absolute must for oily skin!

This is the only moisturizer I will use on my oily, acne prone skin. It completely refines the texture of my skin and feels like an instant facelift. My skin looks smoother and more balanced. Not too oily, not too dry, just right.

I will always use this product. It really helps with oil control and is loaded with vitamin C and smells great.

This is the best Vitamin C product I've ever used--it sinks in and absorbs well, and helps to produce that Jan Marini "glow"--there's no question that used together, the JM products really work to keep skin clear and pores small. One caveat: where your skin is very dry, use a good moisturizer afterwards to prevent the lotion from "rolling up" on the skin.

After using for a week, I noticed the texture of my skin changed. My skin was smoothe, soft, and more radient. I still break out a bit, but my skin is more resilient.