doesn't this contain propylene glycol and isn't that antifreeze?

The short answer is yes and no. Propylene Glycol is something that can be used to either prevent something from freezing or change the temperature at which something freezes and it is part of a group of substances which can do that, BUT I believe you’re thinking about the kind of anti-freeze commonly used in vehicles, the one which we're all warned against drinking because it can be poisonous to humans and many pets. That substance is Ethylene glycol not propylene glycol and ethylene glycol is considered poisonous because unlike propylene glycol which is either excreted from the body in urine or turned into lactic acid (something our bodies have no problem processing), when our bodies try to process ethylene glycol it starts to affect the central nervous system and can ultimately result in kidney failure (from the buildup of compounds the kidney can’t effectively process) and ultimately death. Propylene Glycol is generally considered safe for human consumption and exposure up to certain limits, but if you consume too much or are allergic to it then you could have an adverse reaction. For more information here’s what the CDC has to say about the extent to which propylene glycol could ever be a problem: https://www.atsdr.cdc.gov/phs/phs.asp?id=1120&tid=240 And here’s a great basic discussion about the differences between Propylene and Ethylene glycol and the science around the safety of propylene glycol: https://www.healthline.com/nutrition/propylene-glycol#section4

Why is the serum I received yellowish brown when it should be clear?

I’ve experienced the same change in color of my vitamin C serum. My skin anesthetist said vitamin C turns yellow over time when it’s exposed to heat and light because it begins to crystalize. I asked her if the color change indicates a loss of potency. She said there is no consensus but most experts consider any loss in potency insignificant compared to the benefits of using the serum.

Okay. There are two 20% C-Serums. What is the difference between Professional C-Serum 20% and Medical Professional Serum 20%?

One serum contains 4% hydroquinone and the other doesn't, however this one is advertised as containing it but when I received my shipment nowhere on the ingredients was it listed. For the extra price it should have had what I was paying for. It will go back, if I wanted just the 20% C I could have gotten it for $20.00 cheaper. Hopefully this was just a shipping error and not the seller it's self. Since I won't know for sure I am getting a refund. On the products themselves, I have used both serums and they are very nice, the one I wanted is better, gets rid of sun spots and really makes your skin glow.

I have mature very oily skin. Does it make your skin oily and break-out?

Hi There, this is not oily, it is a water based serum that absorbs into the skin. I would gradually add it into your skincare routine to avoid irritation being that it is a medical grade 20% vitamin C.

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Reviews

K**E

Brighter Star Now!

I’m 55yrs old. This is an amazing product, it has helped make my face smoother, brighter, and most of all has lightened all my dark spots on my face from sun damage. Buy Buy Buy!

17.02.2026

K**P

This will be the best serum you have tried!

Great product, absorbs easily and nice finish on your skin. Loved it so much I purchased for both daughters!

27.02.2026

L**K

Buy it!

Feel like it brought life back into my skin. It feels more hydrated bright!

22.02.2026

T**.

Great serum…

I love the product. It’s just too expensive.

25.02.2026

L**A

Love it!

Does exactly what it claims to do. Feels great going on. Not clumpy or sticky. Works well under make up. Been using it for about 1.5years. Amazing results with sun spots.

15.02.2026

P**G

Miraculous

I have used this in the past and it did wonders for my skin. I have adult acne unfortunately and this worsens it so I guess this will be used on my hands and neck.

24.02.2026

B**S

Evens skin tone keeps it looking clean & tight & Fresh

Very wonderful product, I just can’t afford it…

5.03.2026

J**O

Surprisingly great!

Absorbs quickly and noticed a difference to my skin tone within the first week with consistent usage. I follow it with Obagi moisturizer and an SPF during the day. It’s a bit pricey but my skin looks brighter - definitely one of the better Vitamin C products I’ve used. Will order again.

11.01.2026

A**R

I have used the product before and love it. Skin looks visibly firmer after third use. It also looks healthier and tone is improved. Strongly suggest

6.05.2022

T**U

It’s filled with water wasted my money do not fall for it

23.08.2025

S**Y

I wanted to get rid of dark sun spots on my face. It worked within a week. Highly recommended. Wish I could afford more!

30.11.2020

T**A

The product arrived in a bad condition, spilled half the bottle is spilled. The price is high and there is no way to reconcile this. Very BAD Experience !!!

19.12.2023

S**M

Little bit tingly sometimes but use twice a week and I like it. Great product.

6.02.2024

ASIN	B00F6XZZMY
ASIN	B00F6XZZMY
Active Ingredients	ascorbic acid,chloride,sodium hyaluronate,vitamin c,zinc
Best Sellers Rank	#6,570 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #179 in Facial Serums
Brand Name	Obagi Medical
Customer Reviews	4.6 4.6 out of 5 stars (3,483)
Global Trade Identification Number	00362032050539
Is Discontinued By Manufacturer	No
Item Form	Drop
Item Volume	30 Milliliters
Item Weight	3.2 Ounces
Item model number	50539
Manufacturer	Obagi Medical
Manufacturer	Obagi Medical
Number of Items	1
Product Benefits	Proactively fortifies the skin defenses against environmental assaults and encourages skin the rebound from previous damage.
Product Dimensions	2.09 x 1.53 x 4 inches; 3.2 ounces
Recommended Uses For Product	dermatology
Scent Name	362032050539
Skin Tone	All
Skin Type	Sensitive
Special Ingredients	Antioxidants
Target Use Body Part	Face
UPC	362032050539
UPC	362032050539
Unit Count	1 Fluid Ounces

Obagi Medical Professional-C Vitamin C Serum – Helps Brighten Skin Tone and Minimize the Appearance of Fine Lines & Wrinkles – Safe for Sensitive Skin

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