Due to the price of this, I only got a reduced size, sort of like a luxury sample containing enough to last me about a month. After about a weeks use I noticed my skin was getting patchy and uneven. I discontinued and my skin cleared up and went back to normal. I then tried two more times to use it for a week or so, but again my skin went patchy. It didn't break me out, it just messed with my skin's balance in a way that made it look less healthy.
For the first 3 months I thought I would be agreeing with the tonne of people that said this isn't great, but then I changed how I used it and instantly my skin is brighter with my post-inflammatory hyperpigmentation and melasma fading more each day. Instead of using it as a booster with other serums and the products from the resist line, I have started applying it straight on to my skin. A lot of people don't do this because it's quite tacky, but I find it absorbs into my skin after a few minutes no problem. Originally I was mixing it in with the resist retinol serum and getting no results. Now at night I apply PC 8% AHA gel, wait 15mins, apply C15,wait at least 5 mins before following with the retinol serum and moisturiser. I have also started using in the morning straight after cleansing, again waiting at least 5mins before applying the resist brightening treatment, mosituriser, sunscreen then make up. I read an article recently that suggested that ascorbic acid and niacinamide can reduce the efficacy of each other. I don't know if its true but it prompted me to change the way I use it and instantly saw results that are ongoing and very positive. I keep this in a dark cabinet, but recommend refrigerating it as there is more product in this little bottle than I expected and it is likely to go off before I use it all, even now I'm using 3 drops twice a day. So if you are not seeing positive results after a few weeks, try applying more frequently by itself so it can do its own thing, and don't be too conservative as this does go off and you want to maximise the value.
This serum in a dropper bottle has a lightweight consistency. I went through two bottles of this and noticed no improvement in my skin even when using twice a day. When I switched to Dr Loretta's vitamin C serum, my skin brightened within a week.
I love this product! Since I started using Paula's Choice products, my hyper pigmentation has decreased to the point that I can cover it with tinted moisturizer rather than full coverage foundation. I can't single out a specific product, since I bought several at the same time but I'm sure the C15 worked! I find it's easier to use when mixed with one of her serums. I mix 4 drops of this into an antioxidant serum in the morning. I've already bought this three times and I don't foresee switching to a new vitamin C product anytime soon!
Made my skin greasy. Did not seem very potent if it was then it was not very stable. Oxidized and turned orange quickly after purchasing much faster than any other vit. C serum I have tried. I also broke out and skin was not as bright. I saw no positive results from this at all.
My diy serum is far better than this and quickly cleared up the dullness and marks this created. Also my diy serum w/o vit E stays fresh longer. I will no longer purchase any vit c serums as I am having better results with my homemade serum instead.
This is crazy expensive enough that I only bought the sample and I am trying out other vitamin C serums to avoid repurchasing. That said, the only thing I dislike about it is the price. The serum itself is fantastic. I can't comment on how it works on its own, but with Lacura's Q10 nightcream it is fantastic. I have very fine lines below my eyes, and a few weeks of mixing this serum with the Lacura and applying it and those lines disappear! However, they came back once I ran out of the serum. I'm currently trying cheaper alternatives, but if I can't find anything, you better believe I'll go back to PC even if it is expensive.
I love the DIY vitamin c serum that I make for myself. However, this serum really doesn't seem strong enough to do much. I got this as a free sample with my PC order, but there was enough to use almost daily for about 3 weeks. No irritation, but no results either. I'll stick to my homemade.
Bought the sample a few times to give it a fair shot and didn't see any results. However, her other products have worked wonders for me. Also, most of her products already contain Vitamin C, so to have it as a stand alone product didn't seem feasible, especially for the price!
I've been using this serum pretty consistently for about 6 months. It is by no means a miracle in a bottle, but is a pretty decent Vitamin C serum for the price - especially compared to more expensive brands. My skin is oily & acne-prone & just beginning to see fine lines. I tried this serum alone or under my night moisturizer for about 2 weeks & was not impressed. It was light & sank in quickly, but I saw no results. I checked more reviews & saw others mixing it with with the PC Ultra-Light Super Antioxidant Serum, so I did the same. That must have been the magic formula for my skin because after 3 weeks, my skin was smoother, brighter, & my hyperpigmentation faded by 50%! If you're curious, definitely give it a try - it's amazingly inexpensive - but you'll probably want to mix it with another anti-aging product.
I have been using this booster for around four weeks, and have not noticed much difference. I would not mind going on using it, but this is the MOST user unfriendly product I have ever tried, It comes in a small bottle with a tight fitting dropper. It dries so fast you need to spread it quickly. However, inserting the dropper again is tricky and the bottle is small enough to be easily knocked over. That ended up happening and more than half of this expensive product ended up improving my furniture.
I had read wonderful reviews and I am surprised nobody mentioned the awkward presentation and consistency before. I am not buying again.