In this review, I take a closer look at the Medik8 C-Tetra Advanced 20% Vitamin C Gel Serum and, more importantly, at the question behind it:
What does “20% vitamin C” actually mean?
Because 20% tetrahexyldecyl ascorbate (THD) is not the same as 20% L-ascorbic acid — even if the number on the bottle looks identical. And if you have sensitive, midlife, or retinoid-treated skin, that difference really matters.
In this video we cover:
• 20% THD vs 20% ascorbic acid — how they differ in strength and behaviour
• Whether THD is truly gentler (and what that means for results)
• Texture, layering, and real-life morning routine compatibility
• Who this type of vitamin C makes sense for — and who may need something stronger
• Medik8 C-Tetra Advanced vs the other Medik8 C-Tetra serums
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0:00 Why 20% isn’t 20%
0:48 Intro
0:55 Claims
1:13 Packaging
1:36 Texture and scent
1:51 How to use the product
2:57 How long does it last?
3:37 How does 20% Tetrahecyldecyl Ascorbate compare to 20% Ascorbic Acid
7:42 Ingredients
9:54 Comparison
10:55 Final thoughts
My equipment (affiliate links):
Camera: Nikon Z 6 –
Microphone: Rhode Video Mic Pro + –
As doctor passionate about skin care that delivers results and about well aging, I want to help you quickly and efficiently pick a skin care regime that works, by explaining the science behind skin and by sharing quick product reviews.
I am a big believer that creating a skincare routine that targets your specific concerns is not a matter of your budget. There are many great affordable brands out there: The Inkey List, Good Molecules, Geek & Gorgeous or pixi skincare to name a few of my favorites, and if you know how to combine them, you are well on your way to healthy and happy skin.
Healthy and happy skin does not mean “flawless” – whatever that might be. I have been struggling with acne, hyperpigmentation and postinflammatory erythema (PIH and PIE) for most of my adult life, and it took me a while to figure out that gentle is key. I went through a retinol damaged skin barrier, acne flare ups and sun damage until I finally reached my happy place: With Tretinoin, sunscreen and of course a red lipstick!
Disclaimer:
I am a doctor, so I do have a good understanding of scientific studies, skin and ingredients.This video is not intended to provide diagnosis, treatment or medical advice. Content provided on this Youtube channel is for informational purposes only. Please consult with a physician or other healthcare professional regarding any medical or health related diagnosis or treatment options. Information on this Youtube channel should not be considered as a substitute for advice from a healthcare professional. The statements made about specific products throughout this video are not to diagnose, treat, cure or prevent disease.
Links used above are affiliate links and most products mentioned are PR-Samples/ gifted items.
This is not a sponsored video.
#doctoranne #beautydoctors #askdoctoranne
Topics in Video:
Medik8 C-Tetra Advanced, Medik8 vitamin C review, THD ascorbate vs ascorbic acid, 20% vitamin C explained, tetrahexyldecyl ascorbate, vitamin C serum review, vitamin C for sensitive skin, Medik8 C-Tetra Luxe, THD vs L-ascorbic acid, Doctor Anne skincare
skincare, skincare routine, skincare review, skin care, skin care review, skin care routine, anti-ageing skincare, collagen boosting skincare, well aging skincare, wellaging, well aging
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