i would love a video about facials . which facials aren't worth it, which are worth it, and what "facials" should be done by dermatologists

Really informative as always. Because of you, I bought Sunday Riley's Vitamin C and I hope you release your own. Because I'm going to replace my Sunday Riley's with yours in a heartbeat.

The most thorough and easy-to-understand explanatory video on different forms of vitamin C so far!!

Have you tried Paula’s Choice Super Antioxidant Serum? It uses Tetrahexyldecyl Ascorbate and costs less that $50 😊

Dr. Idriss, can you make a video about azelaic acid and it's different derivatives (Azeclair) in this style? I'd really like to know which ones are most useful for rosacea + melasma (and budget friendly). Thank you for your time and dedication ❤️

You are amazing, all of this is so confusing without your generous time and effort to educate, thank you Shereene

after struggling with ascorbic acid for years, i finally gave up and moved on to 3-O ethyl ascorbic acid this year. it's such a game changer! i'm so happy i did, and i use the one from Biossance. it's an incredible serum.

Am I the only one obsessed with how beautiful she is and her looks? Love how jewelry looks on her! Also, forever grateful for the content.

Another wonderful video. This update is greatly appreciated. Glad to always learn more about Vitamin C. Interesting to learn about it being a “sidekick” to SPF and boosts collagen production 😍. Who knew? That’s why we love you, your brain, AND sense of humor 💕💕

Thank you Dr. Idriss for such well organized and super informative content. I’m a heavy tretinoin user, but currently playing with vitamin C, because I have never successfully worked it in without irritation, and I want to so badly. I feel armed with a couple new ideas to try and I love knowing that twice a day is potentially good.

Just wanted to give you a heads up about Tetrahexyldecyl Ascorbate vs Ascorbyl Tetraisopalmitate which have a different structure (potentially significant difference in ability for the skin to utilise these chemicals). For whatever reason the names seem to be used interchangeably by many brands. They do have the same molecular weight and seem to have been registered under the same CAS number, which doesn’t help either. But, they are not the same chemical. In cosmetics you actually want Ascorbyl Tetraisopalmitate, based on safety and efficacy data, hence the cost. Tetrahexyldecyl Ascorbate on the other hand has very little efficacy and safety data. Hope this helps :)

Dr. Idriss, your videos have changed my life!! Thank you. I was wondering if you can make a video addressing Ceramides what are they, what they do, and the best way to incorporate them in our skin care routine. Again thank you for being so generous with your knowledge. It is a game changer and my skin looks healthier than ever. Education is key, you are brilliant and funny, overall I always look forward to your videos.

I love timeless vitamin c. The 20% doesn't irritate my skin!

Thank you so much for making a part 2 discussing these ingredients... The ordinary has both of them... Please its a request when ever a skincare is available in ordinary do talk about it as well cuz for some of us aside from ordinary cera ve and some aveeno all of these brands that you talk about are not available in our part of the world... Thankss❤️

Thank you! I do hobbyist level cosmetic formulation, and I was trying to decide between all the C derivatives for a body lotion. You gave me exactly the info I need ... I'll be going with THD ascorbate. [The ingredient suppliers do not always have the best info.] This is why I love your channel. You give plenty of technical info, but explain it so those of us without advanced degrees in chemistry can understand.

I'm one of those people you mentioned whose sensitive skin reacts very strongly to the low PH level of ascorbic acid serums. I've been searching for detailed info on these 2 specific alternative forms of Vit-C. As well as recommendations for possible products I might try. You have answered my questions. Thank you! 👍👍👍

Thank you! I love your videos, always detailed and accurate. Also there's a Vitamin C serum that I bought once like last year from a small brand called Ardent Berry, it was really expensive and a bit oily but it lasted me a long time and the results were amazing. after watching your I looked at the ingredients and the Vitamin C that they use is Tetrahexyldecyl Ascorbate! and there's also Licorice extract omg so that made sense why my dark spots improved so much.

I am really loving the Allie’s of skin vitamins c serum , it doesn’t irritate my sensitive skin at all and I love the thin consistency of it. It works wonderfully with my combination skin!

Wow! These 20 minutes felt like 5. Very great info and products!! I really been liking the CEO Glow but I use it in the oil form I been LOVING it!!

The second your brand comes out I’m buying every single product, I cannot wait 🤍

Thank you for this video! THD sounds amazing and I hope that future studies continue to validate its efficacy. Hoping you can make a video on microneedling soon!

I love paula's choice super antioxidant serum. Has THD as its 2 or 3rd ingredient. Not for oily skin though. Very thick.

My everyday regimen that helped me get glowing, spotless skin in a short amount of time: - Start with a glass of warm water on an empty stomach. - Wash face with besan powder and rose water pack, then pat dry. - Apply litttllextra rice berry vitamin c face serum for a glowing complexion and hydration. - At night, use milk and turmeric mix on face, then wash off and use toner and aloe vera gel. - Always go for greens, fruits, nuts, seeds, and work out 4-5 times a week or practice yoga.

This was a really good explanation of the benefits of alternate forms of vitamin c. I had always dismissed types of vitamin c that were not ascorbic acid, however i may have been too hasty in that assumption. I don't know what other videos you are currently planning to film but i would be very interested in learning more about common procedures performed by dermatologists or aestheticians like microneedling.

Tu parles français merveilleusement ❤I love your content. You are great at explaining in a way that it’s clear for the common consumer (me!!!!).

Thank you, Dr. Idriss. I have tried and like Ghost Democracy Lightbulb Vitamin C - a THD serum in dropper bottle, but I add a pump (I add a pump to all dropper bottles), Algenist - makes 2, a THD one, and an algae derived Ascorbic acid, Melano C Intensive Anti-Spot Premium Essence in an airless, opaque tube with both AA and EAA from Japan, NIOD's is very high percentage EAA, so thank you for explaining that is not necessary.

Girls, I use Monsia's Perfect 10 a lot, it's essential for cleansing oily residue and removing makeup, the best thing is how soft and moisturized it leaves your skin. I wouldn't change it for anything, I recommend them💗😊

Can you Please give a review of korean skin care products based on vitamin c that can help us to choose right vitamin c products

Youth to the People has a c serum with both plus the magnesium version of vitamin c. I’ve been using it for 2 months with great success. So far results have plateaued but have left me with brighter, more even, healthier looking skin. I’m definitely okay with that.

I love those colourful bottles behind next to the mic..Thanks a lot for the video. Please cover something for those who have acne prone skin and are allergic to benzoyl peroxide at the same time. Also, something that is absolutely safe for those who are acne prone and are pregnant too.

Im so glad she did this video. I was really curious about these vitamin c, shes a life saver.

Bliss also has 3-0 ethyl ascorbic acid in it for about $28.00 a bottle as well as olay vitamin c with peptides , niacinimide and lactic acid for about $35.00 a bottle.

PLEASE POST ON ANDROGENIC ALOPECIA IN WOMEN WITH PCOS AND HOW TO OVERCOME IT

so glad you love the Summer Fridays cc me serum!!

Thank you so much for all the amazing education you are giving all us mere mortals who will age, who will have skin issues, and what we can do to help ourselves. Please, can you give us all your advice on how to heal sun damage? I am a mixed kid and my dad’s side is dark toned and never believed in sunscreen. “Sunscreen causes cancer!” is the philosophy. I am now in my mid twenties with otherwise good skin but tons of dark spots and freckles. My skin just hasn’t held up as well as my aunts, uncles, cousins, everyone because I’m mixed and I’m lighter. I spent my entire childhood baking in the sun, getting burned and peeling and now my skin is damaged. I am sure I’m not the only one, so please! Give us your medical advice! On behalf of all your followers-we love you so much!! ❤️

Could you please do a video on what ingredients to avoid? I'm becoming more aware of skincare (thanks to you), and will start using products you recommend, but I've still got some other products left that I'm a little hesitant to use now. Thank you for providing us with such great scientifically-based information!!

Thank you for reviewing 3-O-ethyl ascorbic acid. I’ve been using the Bliss World serum and loving it, but I wasn’t sure if this form of vitamin C was a reasonable ingredient or not. The video is very helpful.

I live in the UK and Boots has a vitamin c serum for 6 pounds which has 3-O ethyl ascorbic acid. I stopped using it for a bit and my skin got so shit and now ive started again and my skin improved like overnight! It's so much clearer and brighter but not shinier

I've been using the Vitamin C complex serum by Naturium and have so far liked the results. But I think I'll be giving the glow recipe a try once my bottle is done.

I appreciate your quality content so much. And that you, as an actually working derm in real life, always give us such good advice here on KZfaq. Thank you!

I use the ordinary thd form and I really like it. It's easier to use than L ascorbic acid and doesn't stain my nails!

You're the best, I just love watching your informative videos. I have one request, when reviewing/recommending products can you mention what the product should NOT be mixed with. 😊

THDA and ATIP are probably my two favorite derivatives. I'm currently testing and liking the 35 % Vitamin C Serum from SobelSkinRx: that one contains 3-O ethyl ascorbic acid, tetrahexyldecyl ascorbate, sodium ascorbyl phosphate, and ascorbyl glucoside. The texture on it is nice, too: I find a lot of products with high levels of 3-O ethyl ascorbic acid are often in organic solvent bases, which tend to sting on my skin after shaving, but the SobelSkinRx one is like a lightweight lotion and non-irritating. The Glow Recipe one sounds neat, so I may give that one a try in the future 😁

You videos have completely helped transform my skin and skin care routine. Thank you so much for all you do! I have less breakouts, less pimples and my skin is even brighter 😭💕💕💕💕🙏🏻

Thank you for your informative videos! Can you tell us what the primary research says about layering vitamin C (especially the active form) with BHAs and AHAs? The internet is divided on this matter - some say mixing direct acids with ascorbic acid messes up the pH that it needs to be effective, others says they are actually synergistic.

Haven't heard of these forms of vitamin C before, noted and thank you!

I love the Kate Ryan Vitamin C Daytime Repair Serum (THD) and priced well. Loaded with additional great ingredients.

Versed has a serum called "Auto Save" that has 3% THDA in it for $25 USD if anyone's insterested. I love it so far (about a month in). It also has other powerful antioxidants and even iron oxide in it (not sure if this gives the visible light protection or not but it's in there).

I bought the glow recipe vitamin c and love it, no break outs so gentle and smells divine, thank you so much for your amazing tips and product recommendations ❤❤❤

Hi dr. Idriss, thank you for sharing your knowledge, you definitely taught me a lot. Something I would like you to talk about EGF and especially in connection to cancer. Thank you and many wishes from Germany :)

Edit: Vanicream has a Vitamin C serum that has ceramides and THD Ascorbate, and no HA :) I am going to try it out. I don't really have dark spots or hyperpigmentation, but I do have rosacea and really need my sunscreen to do it's job! I've used cocokind, mad hippie, and Seoulceuticals. I liked cocokind a lot until they reformulated it to add a mystery % of AA (I already use azelaic acid 10%). I never had good luck with any of the others I've tried. I will look into THD Ascorbate!

Would you be open to doing a video specifically on pore minimization? Thanks for your videos! They’ve dramatically improved my skin 🤗🙏🏾🤗

MAP made my sunspots worse so three days ago I switched to 3OEAA, hope everything works out 🤞🏻

Helpful yessss always!!! I am married to my vitamin c from la roche posay my skin really likes that one! Thx Dr you are adorable ❤️

Hi, Dr. Could you please make a video with dupes of these products. The ones you showed are really expensive. Thanks

I think I'm more confused, but I still find it helpful

Medik8 has a C-tetra and it is also tetrahexyldecyl ascorbate based with vitamin E and it’s lovely

I've used many bottles of the Glow Recipe Guava serum which I love, but it's soooo expensive. I also used Dr Vanita's Antioxidant power serum which also has Tetrahexyldecyl Ascorbate but is much cheaper with a nice gel texture. I much prefer derivatives as pure vitamin C always oxidises and irritates my skin. I find that Tetrahexyldecyl Ascorbate is really rare among vitamin C serums, but I heard it's it's an expensive ingredient.

Thanks so much for this video I have been using Allies of Skin for years now and have noticed a huge difference. I do mix in other brands when I feel like I need a change, I just always seem to go back to them so I thank you for the recommendations.

You gave much better explanation than many other skin Dr's on here one of them being Dr. V. Rattan

My first saturday video!! Thanks for all the information you give us💖

Yes I love vitamin c recommendations and options to have. Thank you for coming back to further expand. 💕

I've been waiting for this!! Yay! Thank you! I was wondering though what do you think about Ascorbyl Tetraisopalmitate? is it the same as THD?

So informative! Look forward to these videos every. single. week. xo

Thank you for taking the time to post such informative videos for us. What about Ole Henriksen`s Truth products? Truth Banana Bright Glow Serum Truth Serum Truth C-Rush Brightening Gel. Do you have any experience with them? I don`t know if they have the right amount/right kind of C-vitamin in them

Can you recommend an all-in-1 serum for those who want to pack lightly this summer ?

Dr. Idriss please make a video on neck filler for tech neck or how to treat it, I'm 18 and I have 2 lines that are already pretty bad. Everyone says your neck shows age first and I already have pigmentation just from my genes. I'd love to see a term in person when I can afford it but there's barely any non sponsored information.

Can you recommend one that is more cost affordable. I love watching your videos. I have learned so much from you.

For oily skin nerds: do you still feel SAP is the best choice for vitamin C? Any updated SAP products you like?

I love these deep dives you make! You're my most trusted yt derm.

Thanks Doc! 🙏🏻 I’m nearly 70 and crazy for Vit c serum since 10 yrs! I cannot count how many I’ve tried. Huge! I Sylvia on lAscorbic because my skin can tolerate very well! Now my holy grail is with one small brand from Hungary, Geek and Gorgeous! It’s ok at 15%, fresh production batch, easy for me to get it since I live in Italy! Any kind of serum I’ve used I’ve mixed with ferulic by the ordinary, snd since it is oily , it’s great to mix and ensure the absorption! Niacinamide follows and Spf! It’s takes so long to reach at this point, and my skin is really happy! Much love Doc ! Xoxo

I can't wait for your line! But I have to have time to finish all of my skincare I've accumulated before, and save my pennies so I can get yours XD. I'm going to assume it'll cost me an arm and a leg, but I'm hoping it will be good

Thanks Dr I use the antioxydant serum from paula's choice. It has thd amongst a sea of other antioxydants. Love it!

The Sunday Riley also does NOT have hyaluronic acid which is what I was looking for. It's hard to find a Vitamin C serum without it.

Thought I understood and knew Vit C 🥴. I love your explanations and similes. Thank you

This video came right on time. I’m in need of Vitamin C and have been unable to choose one

Which of these Vitamin C’s would you recommend for acne prone, wrinkled, combination skin?

Hi @DrShereeneIdriss, wanted to know your thoughts about Elizabeth Arden’s Vitamin C Ceramide Capsules Radiance Renewal Serum. I am intrigued by this product as each dose is encapsuled, thus preventing air exposure to protect the active ingredients. Would love your thoughts on the formulation! Also side question, I know that avocado oil can be a beneficial ingredient for some, but have you seen that it can be commonly sensitizing? Thanks, would really appreciate a response! :)

I would LOVE if you could do a review of Glowbiotics. Especially their Vitamin C serum 💖

I love your tutorials!💕💕

Hi Doc, I’d love to know your thoughts on finger lime extract and Kakadu plum extract as “vitamin C ingredients” in skincare produces. They seem to be popping up a bit in Australian skincare e.g. Go-to much brighter skin and Biologi products. Love watching your videos and have been enjoying trying out lots of your recommendations.

Good morning 😀. Fantastic video as usual. Would like more clarification on when or how to incorporate acids. Bha,aha, glycolic with vitamin c in morning or evening but also with retinols. How to fit it in 2-3 days a week of acids along the other serums. Thanks 🇨🇦

I am in Canada and love the Sunday Riley serum. The bottle is opaque, the color is white and has no scent. Surprised to see yours not fully opaque with some color

Can you share your thoughts on Sculptra vs diluted Radiesse? I am looking for volume as a 50 years old. Ty love the channel!

Your channel is so informative. Thank you Sheerene 🙏🏻

Two thd ascorbate products I quite like, with reasonable price points: 1) Paula's Choice Super Antioxidant Serum; silicone base 2) Kylie skin vitamin C serum*** I can't believe I like this one; celebrity skincare is an annoying trend. So gentle on my sensitive skin

so what about The Ordinary's Ascorbyl Tetraisopalmitate Solution 20% in Vitamin F? it has THD in it and is much much cheaper than other options

Please tell us more about those beautiful bracelets!!

3-O-Ethyl Ascorbic Acid is the one in BOOST UP by Trinny London, so far I'm so impressed with her products but I'd love to see what you think of her vitamin C serum and her approach to exfoliants etc

hello, excited to try your products! my question for you is can I use vitamin c products along with retinol? love your videos, my skin looks so much better since I have been following you!

The GR Guava Vit C doesn't have niacinamide. GR has a separate niacinamide serum in a similar bottle. I love the GR Guava Vit C serum. My skin is sensitive to LAA & I haven't been able to find a LAA formula that doesn't irritate my face. But, I love the GR formula & have repurchased it many times. I limit fragrance in my face skincare because some scents give me a headache. I have never had an issue with GR. The scent comes from the natural scents of the ingredients & is subtle.

Some other THD serums include Covey, youth to the people (blend of different vitamin c), dezi skin, and surprisingly, Kylie skin lol I currently use Covey. It’s 15% THD and comes in an opaque bottle with a pump and is around $55

Thank you for the informative video Dr. Idriss! Now that I'm 56, my menopausal skin doesn't tolerate L Ascorbic acid well, I'm glad to know THD-A is an effective alternative. Three questions: 1) to get the SPF associated benefit, does the vitamin C (L Ascorbic acid or a C ester) need to be used with SPF directly on top, or can it be layered with other skin brighteners like Faded by Topicals? 2) Can THD-A be used with copper peptides? 3) Is that a Tom Ford perfume (over your right shoulder)?

Love this video! What do you think of the Timeless Vitamin C? I think it’s affordable and works amazing but I would love to hear your thoughts.

"Certain brands that may or may not have been called Drunk Something..." Gurllll, i love you 😍 ❤ 🤣

Great information, thank you! I'm trying summer Fridays because I'm already oily, especially in summer. One question: I use a copper peptide serum at night which the doctorly doctors say would deactivate vitamin c. Do you agree? Thanks so much for putting all of this great information out there! 🥰

Love this video!! So much great info! I've found I can tolerate most Vit C but serums with Tetrahexydecyl Ascorbate makes my skin burn, turn really red and itch in ways I have NEVER before experienced. I did a lot of research to figure that out (thank you spread sheets!) but once I did - it's saved me so much pain, time and money! And I can attest - the Summer Fridays version is heavenly!

If you have IBS, you probably have gluten sensitivity. I didn't believe I ever did, until 23andme told me. I went gluten free. I'm feeling better.

Hi! I watch your videos with great interest. I was wondering what is your opinion of PEGs in skincare products (regarding the risk of contamination with dangerous substances). Thank you very much!

I hate it when they add colour! I bought the new It Cosmetics vitamin C serum, as the ingredients are the same as the Vichy vitamin C ampules. The IT Cosmetics one is cheaper AND it came in a occlusive pump bottle that lets no light or air in. I was so excited about it, but it came out orange from the start! I have no clue if its oxidised or not, and it annoys the hell out of me 😐 Why would they do that?? For all I know the bottle is a dud and it's already oxidised.