How To Use Vitamin C For Best Results! | Dr Sam Bunting

Vitamin C is one of the most useful antioxidants in skincare and a vital part of the morning routine if you’re tackling premature ageing and sun damage.
What’s great about it is that most of the products I rate come in an easy-to-layer format that’s simple to integrate into your morning routine so let me show you how its done!
As always thank you so much for watching and for all your support!
Disclaimer: The content seen in this video is provided only for medical educational purposes and is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Please seek professional help individually if you suffer from any dermatological condition. Due to the volume of patients seen in the clinic, and to the unique nature of skin, Dr Bunting is unable to respond to every query on these videos.

[@susanmcf1]

As always, just the information I needed. Thank you!

[@Lucyhaganportraits]

Love this series! 🧡 Brilliantly formatted information as always x

[@malania3150]

You are so helpful! Thank you!

[@leneskov5184]

Love the videos where you focus on one important ingredient 😀

[@julianaprimas_]

For those who can't or want to afford a vitamin C serum for more than 100 EUR, like me: I use Geek&Gorgeous C-Glow with 15% ascorbic acid and ferulic Acid and vitamin E - it costs 10,50 EUR 😉 And is a european brand (Hungary). What counts, are the ingredients, not brand and marketing.

[@okashi10]

I just ordered it 2 days ago! Excited to try it. Timeless and the Geek & Gorgeous C-Glow seem to be the most highly reviewed affordable dupes for the Skinceuticals.

[@emiledubus2580]

i’ve been using it for 3 months and its incredible idk why its not as popular as the skinceutucals one

[@julianaprimas_]

@@emiledubus2580 Because it is a small company with only little budget for advertisement - Skinceutical belongs to L'Oréal, which is supported heavily by Nestlé 😉

[@greenknitter]

@@emiledubus2580 I love it so much too. I actually think it's better than the Timeless 20% vit C, am seeing better results with the C-Glow. All their products I've tried have been incredible.

[@anja6548]

@@julianaprimas_ because they made a study that only their vitamin C works lol

[@user-ck5yp7me5n]

It’s so nice to see her using other brand

[@maryaustin1320]

Just loving these videos on bk to basic skin care. You make it so easy to understand. Thankyou Dr sam 😘😘

[@DrSamBunting]

Glad you like them! Thanks for watching! ❤

[@Me-nc8pp]

Thank you for this precise info! Pics of the droppers with the unoxidized and oxidized version against the same, bright/white background would be helpful.

[@allegra1952]

Clear and straight to the point! Thanks doctor Sam ❣️

[@DrSamBunting]

That's great to hear! Thank you for watching ❤️

[@lisanefertiti]

Dr please do a video on teen acne... To target the issue early on

[@rajnimehta2497]

@@DrSamBuntingma'am can we use Vit C + Azelaic acid + Vit E mask ?.. Is this order correct?.

[@MaryEllenAfter60]

I've used Timeless Vit. C + E + Ferulic Acid daily for almost 7 years, and have been so pleased with the results. Haven't used it around my eyes, but I'll give it a try. Thank you for the information...MaryEllen

[@tracybownes7612]

Hi, can you get this in the u.k ? if so please can you tell me where, thankyou

[@MaryEllenAfter60]

@@tracybownes7612 You could check the timelessha . com website, Tracy. Skin Deva has the exact same formulation, so you might want to check there. Hope this helps.

[@tracybownes7612]

@@MaryEllenAfter60 have you tried the skin diva one as ive noticed it is on amazon uk

[@leneskov5184]

@@tracybownes7612 I live in Denmark and have used Timeless Vit C for years, but recently it was pulled off the european Market, due to too high content of one of the ingredients (one of the “filler” ingredients). I wrote to Timeless and asked about it, and they said that they will have a solution at the end of the year.

[@MaryEllenAfter60]

@@tracybownes7612 Yes I have, and it is just as good as the Timeless, in my opinion. Check the Skin Deva website, they frequently have sales - 20 to 25% off

[@kristinej.9599]

As I understand it from my own research, peptides and copper peptides also should not be used in the same routine with ascorbic acid. Copper & l-aa counteract each other, and peptides don't work in low acid environments -- so no C or BHA/AHA (unless the peptide product is specifically formulated to work with them.)

[@reginaceliarodrigues6640]

As a mom, I wish you made vídeos about teen skincare. I really believe targeting the issue early would be the key to controling the inevitable hormones damages better. Justo a thought....😉

[@lisanefertiti]

Yes please. Hopefully she sees this

[@claudiadgusmao]

Dr Emma has a video on this on her Instagram and I believe Dr Sam has a live with some information on her Instagram. There’s also a video Dr Sam did with Caroline Barnes on KZbin

[@alexavasquez1992]

Dr dray has good guides on skincare at different age ranges

[@marilynmccall2879]

Yea, I agree.

[@hintoflavender6415]

Yes, I fully agree!! My little sister is just getting into her teen years and the only person who's a certified derm I can find for anywhere around teen years is Dr. Dray... And she really only gets as close as 20's... With that being said, she is still great for it and also goes into places like Walmart, target, Sam's, and walgreens too so the products are pretty relatively cheap.

[@QuirkyBoy]

I love live demo vids so much ❤️

[@DrSamBunting]

So glad to hear this! Thank you ❤️

[@christinab5778]

Can you discuss the benzene in sunscreen issue and also address how this might impact your skincare line? I’ve been interested in how this might be impacting people who have their own lines.

[@ellay4514]

Great to hear all this info and about the old study and that vit c and niacinamide is fine to use together. I learn so much from your videos :-)

[@susannataylor7106]

Great video, love your accent.

[@olfactoryodyssey5359]

Ce férulic from Skinceuticals is THE ONLY product I buy repeatedly from the brand as it is absolutely AMAZING! I would literally give up on my daily coffee if I had to in order to buy this product. It is worth splurging on as it has helped brighten my skin after 3 yrs of everyday use and my hyper pigmentation has faded too. This is one holy grail product I will never ever give up. I’m from south east Asia this dr. Sam you are the best!

[@emilyhoward7899]

Really helpful, I was specifically wondering if I could use around my eyes, now I won’t be afraid to try my new c e ferulic serum on my crow’s feet. I hope it helps! Thank you!

[@msb1404]

I used the Ordinary Vit C. You can buy this on Amazon. I like the Ordinary skin range.

[@MissWanza]

Thank you, Dr. Sam! And, by the way, I'm literally wearing the same pjs 😊

[@sophiajardine3894]

Thanks ! I’m going to turn 60 in April 2022. I found this very useful. I know it’s late but I’ve just started considering a skincare routine. As you can imagine I have so many questions about how, when and what to use .

[@DrSamBunting]

Glad this was helpful. You can also try our routine finder to help you with order in which products should be used: drsambunting.com/pages/routine-landing ❤

[@sophiajardine3894]

Thank you so much!!

[@binitajoshi8735]

Thanks

[@nicolenew1708]

THANK YOU

[@mjuellarsen]

This was very helpful and informative. I just bought my first vitamin C serum and now I know how to use it! Thank you!

[@DrSamBunting]

Glad it was helpful!❤

[@julianacascante7558]

Thanks for the info. If I may say, I drop Vit. C directly on my face and spread it with the tip of my middle and ring fingers thinking that putting it on my palm will cause waste. Then I drop some also on my neck. Thank you. ❤

[@l.m.5286]

Can you please cover copper peptides and what others ingredients play well with it on face? Thank you! ❤️😊

[@abovetheclouds1771]

Enjoyed,I just started using Vichy Vit C as recommended by a Dermatologist here on KZbin. I like very much. Can you recommend Best facial peel for home use? Thank You

[@user-ij9bs9ke9j]

I hope this works as well as Cartier does for flexx'ing!

[@SandiTink]

I used to use the C serum from Mad Hippie for years. But I developed an intolerance to it. After doing some research, I purchased the Timeless 10% C serum with E and ferulic acid, which I started today. I waited to resume using a C serum until after I healed my skin barrier (or mostly healed it). I’m experiencing minor irritation from it, so I’ll try every other day until I can tolerate it easily.

[@meltedheart2.0]

Very nice day

[@anayanandini]

As someone with combination skin, finding the right Vit C serum was important for me. I started using liettlextra riceberry vitamin c face serum about three months back, and I'm happy with the results. The serum's thin, watery consistency makes it easy to apply and it quickly absorbs without leaving any greasy residue. Within just a month, I noticed a significant improvement in my skin's texture and overall glow. What sets this serum apart is its premium quality-it feels luxurious and is clearly made with effective ingredients. I apply it post-cleansing in the morning, and it mixes well with my sunscreen and makeup. I also use retinoids at night, and together, they've transformed my skincare routine. I can confidently say this serum has become essential in my daily regimen. I highly recommend it for anyone looking to achieve a radiant and even complexion!

[@nosheentawassul1999]

Thanks dear Very happy to see your suggestions Can I get your online appointment because I am outside UK?

[@andyvero9631]

Hi Dr Sam I have bought La Roche-Posay pure Vitamin C to start with my morning routine, my question is, after I done my cleansing routine I usually apply THE INKEY LIST HYALURONIC ACID SERUM , should I continue to apply this before the Vitamin C? Thank you! 🌸

[@traumaqueen45]

I prefer Mario Badescu & prefer to alternate between Vitamin C followed by Hydro Moisturizer With Vitamin C & Super Peptide Serum followed by Peptide Renewal cream. Even buying all 4 products is just slightly higher than the 1 product in this video.

[@emmasecillano6976]

Wow I subscribed right away after all the information,thanks Dra.Sam…I’m Emma from Australia.:skin ceuticals it’s sooo expensive,so I’m using sunday riley 15% vit c,I’m impressed with the result..after this 🙏I go with skin ceuticals ferulic acid.

[@catnip4587]

How do you feel about vitamin c powder that you can add to your serums or creme.?

[@ljd3766]

Brilliant video. Are you from N Ireland? Anyrecomendations for tiny black heads on fine, sensitive young skin? Thanks ❤️💕❤️💕❤️💕❤️💕

[@logiclanguagelearningFrench]

Spin the dial spin the dial! Which accent will she be today. Irish, Sloane English or American. I love it!! Haha.

[@marilynmccall2879]

I use an Anti-Aging Vitamin C Serum 20% Vitamin C Hyaluronic Acid Vitamin E. Is this a good one? I've been using it every morning for about a month now. Can't say I have noticed a difference in my skin but love the smell and feel of it on my skin. Is this a good one to use or should I change?

[@Mairah21]

I love your wrist watch, trying to guess the brand or name the whole time i watch this video☹️

[@kulvinderdhaliwal2802]

Thank you! I'm starting to see lots of information on whether certain ingredients, or rather the % of actives, are suitable for skin of colour. I've become conscious that lots of products aren't really made with POC in mind amd become selective on what I buy. Would be good to get your view on this.

[@TheResearchQueen]

If a certain Indian dr has influenced your view, I just wanted to point out that there is a lot of concerning stuff coming out about her on Instagram. See Tanvi.x on insta, her highlight called ‘awareness’

[@mariangrimsdell1112]

I am a typical low melatonin Caucasian woman with very dry skin, interesting but I get great results using some Ayurvedic products containing neem, coconut milk, organic cold pressed pomegranate oil, also I rinse with leftover brown rice water on my hair after shampooing, then I spray a mist of rosemary water and towel dry, if you cannot get these above ingredients try the Happy Hippie for various skin care products.

[@hayleytempleton5247]

Hello 😀 I'm using a vitamin c in powder form and mix it with my moisture. It's says it can be mixed with niacinamide serum or moisture. But if I use it with serum I end up using double the amount of serum to mix. Which is the best way to get full benefits of the vitamin c please Really enjoy your talks thanks so much

[@adellaoconnor9228]

I’m guessing Vit C is the next product I. Your line I’m looking forward to seeing that!!!

[@claudiadgusmao]

The Brightly serum has a vit C derivative :)

[@tounidari]

I just came across your video! It’s wonderful, I just purchased my first bottle of SkinCeuticals vitamin C E Ferulic serum, I wanted to know in which step of the morning skin care routine should I apply this product? So I use La Mer and I’ve been using it for about nine years now and I wanted a vitamin C to add to my routine. So my daily ritual is that I cleanse my face, I exfoliate my face only twice a week, then I use the La Mer treatment lotion Follow by the La Mer serum then I apply the new La Mer hydrating infused emulsion serum and after that I apply my crème de La Mer cream and sunscreen. It would be very helpful if you can let me know on which step I should use my vitamin C serum? Thank you and have a lovely day.

[@michellethole]

Thank you for the brilliant info as always, Dr Sam. Is Vit c ok with peptides? Could I please ask that you suggest ethical, cruelty-free and/or cheaper options in your videos too?

[@nasianikolova]

Peptides become less effective in an acidic environment. It's not recommended to use them with Vit C or AHAs/BHA. You can perhaps buffer in between.

[@nikkil764]

I used a resurfacing pad this morning by Derma E that contains fertile acid, resveratrol, DMAE and topped it with their Vitamin C and hyluronic acid serum. Are these compatible? Then I used Estée Lauder Resilience peptide moisturizer under my make up.

[@stratolightdude]

What... a WONDERFUL... video!!! I loved this demo and the 13-dot technique was super! I have 2 questions and I hope you will get to see and answer these doc. 1. You said VitC+AHA = compatible. If i wanna pair VitC with Glycolic acid in the morning ...., would i go about it in this sequence, [ cleanse > VitC > Glycolic Acid > moisturizer > Sunscreen] ? 2. I've been using this Olay VitC+Peptide24 brigtening serum for 2-3 wks now and I love it. I understand it has 3-0-ethyl ascorbic acid, which is gentler. My question is ..., is it supposed to be of milky color/consistency? I understnad that L-ascorbic is clear to yellowish in good form. I also understand that it's very unstable and can oxidize into orange/brown color (which is useless at this point) fast but with 3-0-ethyl ascorbic acid, i can't tell if ive ruined my product or not.

[@keerthireddy4993]

Can I use in combination with glycolic acid or alpha Arbutin???

[@melissah.mccormack2275]

Would you use clindamacin or vitamin c first?

[@shadowreaper5413]

How many drops should i use please?

[@ginar51]

I wish you would give other examples besides the Skin Ceuticals.

[@NNN341]

Timeless, G-Glow, paula choice 😇

[@ginar51]

@@NNN341 Thank you 😊

[@bnb0510]

That’s the only one with actual scientific data behind it that’s probably why. Dr Dray doesn’t promote vit c but she has stated this would be the only one to use if she did.

[@jessicawarn2010]

@@bnb0510 actually doctor dray does promote vitamin c. Watch her lastest vid..

[@bnb0510]

@@jessicawarn2010 i saw the video. She never promoted it. She said “if” you want to use it, Skinceuticals would be the one. She doesn’t believe in vit c but thanks for coming to try to correct me 3 minutes after the video was released…

[@ashima48]

Watch it at 1.25x min. You will thank me. 🙂

[@wendyarch332]

would you recommend affordable vitamin c serums? How about VIchy ampoules?

[@esteravisovan9003]

Which exactly vitamin C do you recommend please?Because there's many vitamin C and I am confused which one to choose. Thank you

[@georgeethomas4442]

Can we use moisturizer after applying serum

[@jensummers2]

If you skip washing your face is the morning (and moisturized the night before), is it pointless to apply vitamin C in the morning? I typically wash my face in the morning but sometimes in the winter I’d rather not, but I also want to make sure my vitamin C application will be effective.

[@markh8710]

My acne is getting better! AM routine:benzoyl peroxide 4% wash. Vit.C from klairs. Laroche Posay moisturizer. Drmtlgy tinted sunscreen. Pm routine: oil cleanser. Benzoyl peroxide wash. Vaseline protecting sensitive area like around eyes, edge of nose and corner of lips. Retinoid 0.05%. Laroche posay moisturizer.

[@scienceislove2014]

I thi k this routine is a bit counter productive .. becuz vitamin c is an antioxidant and benzoyl peroxide is an oxidat... And it's not like you wash everything off ..so some benzoyl stays in your skin to deactivate vitamin c..

[@seansaw4858]

Can you use Copper peptides with vitamic C at the same time, like the NIOD CAIS 2? Or The ORDINARY Buffet plus Cooper peptides? There is so much confusion on the web!

[@caseyconner5880]

Hi i wrap my vit c dropper with duck tape so no light gets in. Also when i open it i put something over it to help keep air out.

[@scsmurfette2196]

Maelove 15% vit c is very gentle for sensitive skin.

[@shaishaji5059]

Yes using it currently for my sensitive skin . Was using Paulas choice before .loved Maelove

[@maninderjitkaur2179]

Hi doctor, I started my job at mid night and finished in early morning. Consequently i sleep in the day time. So when I have to use the serum?

[@abuhaytham-7492]

is there any side effect of prolonged use of vitamin c?

[@Farah-lw9py]

Hi Dr Sam. Does vitamin C around the eyes, make the skin their dry and thinner?

[@itashya]

Hi, thanks for talking about it. I’m currently using fixderma Aha lightening gel HQ which has glycolic acid and hydroquinone and others. Can I layer these? If not then how can use them best? I have a sensitive skin but my skin is used to acids. I do have hyperpigmentations (really bad ones). I thinking of adding Vitamin c by ordinary as well. I have read it could be a good combination to treat the skin condition. Would appreciate your suggestions. Thanks in advance

[@tiffanybaltimore3757]

Can you use vitamin c if using a wash off benzoyl peroxide?

[@swineinny1]

Others suggest using an Salicylic Acid cleanser before Vit C to prepare skin to “receive” it more effectively at proper PH level. What are your thoughts?

[@DrSamBunting]

Unecessary.

[@marrefalken7744]

Dr dray..

[@esn2130]

Yep, I heard from her

[@chkvk]

Have you tried the Glow Maker from Maelove? Also, do you offer vitamin C in your skincare line? I didn't see any.

[@2PuppyProductions]

This is so helpful! I have been using the Vichy vitamin C serum and the challenge I have is it absorbs so quickly into my skin I have a hard time getting it evenly distributed. Can you offer any suggestions? Thank you so much for all the information on your channel. It's awesome!

[@simon6932]

Paula's choice Super Antioxidant concentrate serum

[@jasminateodorovic1248]

Geek&Gorgeous one has an excellent ingredient list for stabilizing the content. Watch Dr Dray's video on the entire line. It also has a required PH 3 to 3.5% that ensures its effectiveness. Plus, more than affordable. As for these pricey options, tried so many of them. Oxidized in a matter of 4 weeks, approximately.

[@esn2130]

Since the skin repares at night, if one would want to get more collagen production, would it be not more beneficial to use at night???

[@shalinipradhan1636]

I'm using a Vitamin C serum which has a form of it called Sodium Ascorbyl Phosphate. Is it a good form to use? If not, what other forms of Vitamin C would you suggest using other than the L-Ascorbic Acid one? And in what percentage?

[@beadalmeida]

Yes, the best one after L-ascorbic. Very stable, proven to work for hyperpigmentation, acne. Dr. Shereene Idriss has a video going more in depth in regards to the acids.

[@erikaruv22]

Can you layer BHA 2%(paulas choice) then the vitamin c?

[@winiliuabonmai3146]

Which serum is good for pimples n oily skin

[@vkng_drag0n982]

I use the Eva Naturals 20% Vit C but mine include 3.5% Niacinamide, 5% hyloronic acid, 2 %salicylic acid, 10% MSM, and 2% retinol Is ok to use this in the morning time? I use a big hat and sunscreen daily but Idk if this will react with sunlight.

[@beatrice2236]

Does it really matter if it is in an airless pump or in a bottle with a pipette?

[@josephinevera9966]

Can this be refrigerated to prolong its shelf life?

[@sj12073]

Please can you clear up a little confusion for me? I have dehydrated skin so i really like to spritz my skin before applying my moisturiser. However, im aware it may affect the vitamin c any advice on how to get around this ? Looking forward to receiving my flawless moisturiser intense❤

[@cornerpocket7077]

how much time after applying ascorbic acid can you apply moisturizer

[@LaLa-bb5kb]

What is the best to best Otc vit C serum? Thank you for this information it is so useful I always take notes on this channel

[@tringting101]

Skinceuticals is not prescription, it's OTC...you mean cost effective?

[@sethrintatu]

Check out the budget dermatologist and Angie of Hot and Flashy on KZbin. Angie tested a few vitamin c serums with ph strips a while back

[@clisaa6974]

can you use l-ascorbic VC at the same time with a peptide serum that has Copper Tripeptide-1, Acetyl Hexapeptide-8?

[@Youmightwannaknowthat]

I think thats a no

[@unavoce9342]

thank you for your video, I am a great follower, using all your product

[@DrSamBunting]

That's so great to hear! ❤️

[@Donna-cc1kt]

How can one lessen the percentage of the strength?

[@gokulnath2256]

Can we apply moisturizer after vitamin c??

[@shubhcheema6519]

I used serum 10 from skinceuticals n it was fine but when I stopped n restarted again, it gave me a bad breakout.

[@unavoce9342]

Thank you for your answer. Skinceuticals c e ferulic is really too expensive, is the Timeless serum also good?

[@lemonlime1920]

I started with Maelove and loved it! I saw big improvements with my perimenopause skin BUT it always went bad within 3 months. I switched to Timeless about 6 months ago and like it equally as well AND it comes in a pump, so it doesn’t turn yellow as quickly. 6 months and I’m on the same bottle. I wear it 2x/day.

[@stephaniebissett5719]

New sub here, great tips!! Im using the Timeless 20% Vit C setum, Vit E, Ferulic acid. I apply to skin thats damp, (from Fresh Rose Deep Hydration toner). Do you think thats ok?

[@ngoziowhuru3273]

How about vitamin E

[@honeybadgernasty]

Can you use Dapsone after C E Ferulic?

[@freedomlife5968]

I use the silymarin cf though it can feel a little tacky which is kinda annoying, I prefer the texture of the phloretin cf but i have acne so silymarin cf is better for me and isn't as glowy, i just wish they didn't include the 0.5% salicylic acid lol because i suspect that's what makes it feel a little tacky

[@honeybadgernasty]

Do you find Phloretin C F to make your skin glowy? That's what I'm experiencing...That's why my dermatologist recommend it opposed to C E Ferulic formulation...but it has the same effect on me... I thought it was because the Vitamin E that was causing the shine

[@freedomlife5968]

I don't know why people are so focused on C E ferulic, the Skinceuticals Phloretin CF & Silymarin CF are lovely too and much more lightweight

[@jomuldoon100]

I totally agree! I’ve just started using the Silymarin and I love it however she mentioned at the beginning of the video that it’s use is limited yet never explained why!

[@halfamo2422]

And Garden of Wisdom Vit C at Victoria Health - pretty good dupe from what I can see - and WAY cheaper. Or Timeless, spendy but not that high.

[@mayahobsbawm415]

Probably because both of them contain alcohol, which (in the long run) does more harm than good to the skin. And also probably because C E Ferulic is the original (most studied and also patented) formula from Dr. Pinnell, the other to being something that L'Oreal came up with - no studies, no evidence but same cost as the C E Ferulic. Does this make sense?

[@aasthasindhu7762]

Hello Dr. Sam, I want to know one can use loccitane divine oil with vit. C serum ? If yes , then the oil need to be used before or after vit. C serum?? Would u please tell ?

[@pratikcharai8488]

Can you please suggest vit c other company products for combination and supper sensitive skin.

[@M_K_M_K_M_K]

Is it okay to use my benzoyl peroxide facewash in the morning and then vitamin C? Is that different from a leave on BP in this situation? As a 34 year old who STILL gets hormonal acne, I am tired of waiting for it to pass, and not addressing my other skin concerns (aging, sagging, PIE and PIH). I improved my acne a bit with diet, and I love my BP facewash, glycolic acid (don’t love BHA’s), just started adding azelaic acid again and now feel happy to start vitamin C! I just don’t want to stop my BP facewash, because I feel like everything helps me in their own way.

[@panizshirazinia2218]

Can you use vitamin c with propolis serum?

[@misscamay]

can you use it with hydroquinone?

[@my-bx3wo]

I’m 15 and I started using it yesterday, is it good for me ?

[@amytran7485]

Hello Dr Sam. Serum vitamin c will support anti aging and how many % is right to use. If I first time to use is how many %. My skin little dry after clean, so can I use Olay serum vitamin c +peptide 24. Thanks a lot

[@shahzadi3332]

Serum name plz tell me

[@janetfalconer2341]

Hello Dr Sam. Can I apply Tranexamic acid at night followed by a night moisturizer? I'm skeptical about layering Vitamin C with Tranexamic acid before moisturizer and sunscreen in the morning. Thank you, Dr for any reply.

[@Talkofthetown321]

Can I use Vitamin C Serum , then Retinol Serum , then Whitening cream Vitamin C altogether?

[@maryamelh01]

Is it advised to use a moisturiser on top of Skinceuticals Phloretin CF? or better to just leave it alone?

[@AuntGert5]

At min. 5:23, when discussing Vit C esters-I don’t quite get the term used. I would like clarity on that please. Thanks.