Hyper Vitamin C 23 Serum | 23% Pure Vitamin C + Vitamin E & Panthenol for Face beauty I Korean skin care and Made in Korea

This stuff is actually pretty strong as it is 24% vitamin C. I highly recommend using a little bit on the first few times otherwise it may be too much for your skin. I didn't realize the potency of this no wonder on my first day it hurt a little when I applied this on my face. It wasn't painful stinging but I could feel my skin reacting with a little bit of stinging. Make sure to use this stuff with sunscreen (daytime) otherwise your skin may burn from the sensitivity of this vitamin C. I usually put this on at night and in the daytime I make sure to have sunscreen on and try to stay in the shade and out of the sun. I think this is very reasonably priced considering the concentration. It is 20 mL, a small dropper bottle, but you don't need a whole lot so this bottle should last a while. It didn't have any awful smell like some vitamin C products have, I don't think I smelled anything. So far it is too soon to tell if this helps with any of my age spots but for something with this amount of vitamin C concentration I don't see why not. This product is made in Korea. The expiration date is clearly printed on the bottom of the bottle.

I’m a longtime user of vitamin c serums and ascorbic acid is my favorite form of it. I feel like it has the best brightening capabilities. This formula is really high potency (23%) and I personally haven’t seen higher. This form and concentration normally leaves the skin feeling a bit dry but this serum seems to have been strategically formulated to counteract that dryness. I experienced no irritation or stinging from this high concentration. In fact my skin felt quite soothed and hydrated. I’m impressed by this formulation. Also, it comes in an opaque bottle to prevent oxidizing. I didn’t see the ingredients listed, so providing them below for those who are curious: Water, Ascorbic Acid (23%), Propanediol, Betaine, 1,2-Hexanediol, Polyglycerin-3, Tromethamine, Ethyl Ascorbyl Ether, Hydroxyethyl Urea, Betula Platyphylla Japonica Juice, Ethylhexylglycerin, Adenosine, Disodium EDTA, Panthenol, Gardenia Florida Fruit Extract, Dextrin, Tocopherol

This is a very strong vitamin C serum (23%) & not for beginners. I apply Vitamin C serum almost every day & this one is borderline too much for my skin. It stings a bit & did irritate my skin a bit. This is one you definitely need to work up to & even then, should use only a few times a week, at most. I like that is has no added perfume. It absorbs well. It comes in a dark bottle which is good. Vitamin C is easily damaged by light/heat/air.

This feels great on my skin. I’m feels like a light oil/serum. It did not irritate my skin. I have some sun spots I would love to see improved/ lightened. This has a good concentration of Vit C, so I’m expecting great results when I’m done with the bottle. The darker bottle helps to keep the integrity of the Vit C, which is fantastic. I will update this review if I see significant improvement in my complexion.

Got a damaged package, but there was enough product to use and test. After two weeks of everyday use I see no difference on my skin, nothing changed. The serum texture is not smooth, has no smell and leaves a sticky feeling after it dries. Overall I won't be buying this serum again. Not that cheap either if you consider that it does nothing.

23% pure Vitamin C. What does it mean? It means it is of a higher concentration, and may fade scars as well as brightens the complexion, and possibly revitalize dry skin. After washing my face, I squeezed two drops onto the palm of my hand, then applied the serum to my face and neck. It doesn't irritate my skin at all. Overall, I think this rich 20 ml product gets a 5.

I have been trying vitamin c serums over the past years to try and improve some hyperpigmentation / skin discoloration though I have yet to notice any significant improvements. This ISNTREE serum is probably one of the serums I like the least out of the ones I've tried because it's very sticky. When I put it on a scar on my inner arm, I always feel my skin stick together when I bend it. I'm not sure if this is due to the higher percentage concentration of vitamin c or not. I also have sensitive skin that is known to break out with some vitamin c serums, so I always just do spot treatments with lotion over it. This product has reacted a bit with my skin so that is something to be cognizant of if you have sensitive skin - take it very slow and do not use over your entire face before spot testing over time.

You just can't order this product during summer. This is the third time I've ordered this and the third time is arrived over heated and busted open in the box. The product itself is good and cheap, but if you can't order it during a whole season you'll need to either stock up or order something else. I already returned the previous two but I'm not returning this one. I give up and just won't order this again, at the bare minimum not during the summer season.