Last Updated on November 27, 2025 by Giorgia Guazzarotti
You know the saying, “an orange a day keeps wrinkles away.” (What, that was apples and they keep doctors away, you say? Never mind, let’s just ignore that). Oranges are loaded with vitamin C, an anti-aging superstar that saves skin that’s spent a bit too much time in the sun, gives a tired and dull face a much needed pick-me-up and makes everyone age slowly. Hint: if it’s not part of your skincare routine, you’re missing out. Here’s all you need to know about the Vitamin C in skincare, the best serums with this powerhouse, and how to incorporate it into your skincare routine for maximum glow:
What The Heck Is Vitamin C?
It’s a water-soluble vitamin that comes in many forms:
- Ascorbic acid polypeptide
- Ascorbyl glucosamine
- Ascorbyl glucoside
- Ascorbyl palmitate
- Ester-C
- Ethyl ascorbic acid
- L-ascorbic acid (pure form)
- Magnesium ascorbyl phosphate
- Sodium ascorbyl palmitate
- Sodium ascorbyl phosphate
- Tetrahexyldecyl ascorbate
PRO TIP: if It has “ascorb” somewhere in the name, it’s a form of vitamin C.
Related: Types Of Vitamin C Used In Skincare
How Does Vitamin C Benefit Skin?
How does it not? This guy does everything. Well… almost.
Vitamin C Benefit #1: It Fights Free Radicals
You’ve probably heard of free radicals. They’re molecules that have gone crazy when they’ve lost one of their electrons. To get it back, they attack other molecules. It’s the start of a chain reaction that damages your collagen and cellular DNA and ends in wrinkles. Vitamin C is always on the lookout for those nasty free radicals. Once it spots one, it fights it and destroys it. How? As an antioxidant, vitamin C works in two ways: “it can act both directly, by reaction with aqueous peroxyl radicals, and indirectly, by restoring the antioxidant properties of fat-soluble vitamin E.” If vitamin C is around, those wrinkles won’t show up anytime soon.
Vitamin C Benefit #2: It Boosts Collagen And Elastin
If your skin were a building, collagen and elastin would be the scaffolding that supports it. Collagen is the protein that keeps skin firm. There’s no sagging on its watch. Elastin is its BFF. It keeps your skin elastic. If your skin bounces back when you pinch it, you know elastin’s doing its job well.Problem is, these two are always under attack. As you go carelessly about your day, UV rays, pollution, smoking and all the other usual culprits attack and destroy them.
To make things worse, as it gets older, your skin can’t produce all the collagen and elastin it needs to stay young and firm. Skin starts to sag. Wrinkles appear. That’s when vitamin C comes in. Vitamin C is essential for collagen and elastin synthesis. When it’s around, it pumps up their production a notch or two, helping your skin stay younger for longer.
Vitamin C Benefit #3: Fades Dark Spots
Spent a little bit too much time in the sun when you were younger and now your skin is riddled with sun spots? Or maybe you’re pregnant and, all of a sudden, melasma has made an unwelcome appearance on your face? Or you’ve popped that zit and now a dark spot has appeared where the damn thing used to be? Blame melanin. It’s the substance that gives your skin its beautiful colour. When it goes into overdrive, dark spots show up all over the place.
Don’t panic. Vitamin C can fade them all. It speeds up your skin’s natural exfoliating process, helping to replace those darker and more damaged cells with lighter and healthier ones. Wait! There’s more. Vitamin C also prevents the sun damage that makes your skin produce too much melanin in the first place. Those pesky dark spots won’t come back anytime soon.
Vitamin C Benefit #4: Brightens Skin
Maybe you don’t have dark spots, yet. But, your skin’s looking all dull and lackluster. Its natural glow has completely disappeared. That’s a sign your skin isn’t exfoliating as quickly as it used to. Vitamin C can speed that up. Exfoliation does wonders for your skin. It fades uneven spots, smoothes out rough patches, and brightens the complexion. If you want your natural glow back, vitamin C’s your guy.
Vitamin C Benefit #5: Treats Sun Damage
Vitamin C is very powerful on its own. But, when it meets together with its friends, vitamin E and ferulic acid, it is unstoppable.
A study conducted by Duke University has found that adding ferulic acid “into a topical solution of 15%l-ascorbic acid and 1%alpha-tocopherol improved chemical stability of the vitamins (C+E) and doubled photoprotection to solar-simulated irradiation of skin from 4-fold to approximately 8-fold as measured by both erythema and sunburn cell formation. This combination of pure natural low molecular weight antioxidants provides meaningful synergistic protection against oxidative stress in skin and should be useful for protection against photoaging and skin cancer.”
Translation: vitamin C + vitamin E + ferulic acid boost one another’s effectiveness and the protection your sunscreen gives you.
Where’s The Catch?
Pure Vitamin C (L-Ascorbic Acid) is a pain to formulate with. Both the pH and carrier system must be right or it won’t be able to penetrate your skin. If it can’t get in, it won’t work as well. The concentration must be right, too. Too little and it won’t do anything for you. Too much and it’ll irritate your skin. This is why a lot of brands are phasing out L-Ascorbic Acid in favour of derivatives that are a little less powerful but work at higher pHs and don’t irritate skin.
Are There Any Side Effects?
Yep. Nothing’s perfect, you know. So, what’s wrong with it?
- Irritation: if you use it too much, too often, it may irritate your skin (especially, if it’s sensitive). 15% is a good concentration for most people. Higher may start to cause irritations. Lower, only for sensitive skin who needs gentler care.
- Stability: pure vitamin C is very unstable. When exposed to light, air and heat, it loses its effectiveness (its derivates are more stable, but less effective). Only buy L-Ascorbic Acid serums when they come in opaque, air-tight containers.
WARNING! If vitamin C turns yellow or brown, it means it is starting to lose all its anti-aging goodness. The exception? Some serums have a yellow tint (that’s the colourant). As a rule, if a product change colour, toss it.
Related: Can You Still Use Your Vitamin C Serum After It’s Turned Brown?
What Are The Best Products With Vitamin C?
- MaeLove Glow Booster ($27.95): The cheapest Vitamin C serum in this list, it does everything the others do, but it contains a citrus extract that may be irritating for sensitive skin. Available at Maelove.
- Paula’s Choice C15 Booster ($46.75): It’s enriched with Hyaluronic Acid and glycerin to deeply hydrate skin. Available at Cult Beauty, Dermstore, Sephora, and SpaceNK.
- Skinceuticals CE Ferulic ($169.00): The original Vitamin C serum, it costs an arm and a leg, but it works wonders and delivers what it promises. Available at Dermstore and Skinceuticals.
FAQs
Can I use Vitamin C serum if I have sensitive skin?
Yeah, totally, but be gentle with it. Skip the hardcore L-ascorbic acid stuff at first – that’ll burn like hell. Go for the gentler versions like magnesium ascorbyl phosphate or sodium ascorbyl phosphate instead. They’re not as strong but they won’t make your face freak out. And like, start slow. Use it every few days, see how your skin feels. If it starts getting pissy and red, just back off for a bit.
What’s the best time to apply Vitamin C serum: morning or night?
Morning for sure. I mean, vitamin C fights all the crap your skin deals with during the day – sun damage, pollution, all that stuff. So it makes way more sense to wear it when you’re actually out there getting hit with free radicals. Plus it makes your sunscreen work better. You can do it at night too but honestly you’re kinda wasting it when you’re just lying in bed doing nothing.
How long does it take to see results from Vitamin C?
Okay so don’t expect magic overnight because that’s not happening. The brightness thing? Maybe 2-4 weeks if you’re consistent. But dark spots and wrinkles? You’re waiting like 8-12 weeks, maybe more. I know it’s annoying but your skin doesn’t work on your schedule. You just gotta keep using it and not give up after a week when nothing’s changed yet.
Can I use Vitamin C with retinol or other active ingredients?
You can but maybe ease into it. People used to say never mix them but that’s kinda bullshit. The real issue is they’re both pretty intense so throwing them on your face at the same time might be too much. Most people do vitamin C in the morning, retinol at night. Works great. Just don’t use it with benzoyl peroxide because that combo literally cancels out the vitamin C and you’re just wasting product.
Related: Which Skincare Ingredients Should You NEVER Use Together?
Why does my Vitamin C serum turn brown or orange?
It’s dead. Like, oxidized and useless. Vitamin C breaks down super easy when it sees light or air or gets warm. Once it’s brown or orange just toss it – it won’t work and might even irritate your skin. This is why the good stuff comes in dark bottles. Keep your serum somewhere cool and dark, close the cap tight every time, and some people even stick it in the fridge to make it last longer.
Do I need to refrigerate my Vitamin C serum?
Not required but it helps. The fridge keeps it from dying as fast. Some formulas are tougher than others – the derivative versions can usually handle room temp better than pure L-ascorbic acid. Just watch if your serum’s changing color fast. If it’s going brown in like a month, yeah, fridge it. Just don’t put it near your food because that’s weird.
What concentration of Vitamin C should I look for?
Somewhere between 10-20% if it’s L-ascorbic acid. Under 8% won’t really do anything, over 20% is just gonna irritate you without working better. More isn’t always better here. For the gentler types you can go higher since they’re weaker. If you’ve never used vitamin C before, start at 10% and see what happens.
Can Vitamin C serums replace my moisturizer?
No. God no. They do completely different things. Vitamin C is fighting damage and fading spots and stuff. Moisturizer is keeping your skin hydrated and happy. You need both or your skin’s gonna look like shit. Use them in order – cleanse, vitamin C, moisturizer, sunscreen. Don’t try to make one product do everything.
The Bottom Line
Vitamin C is one of the anti-aging superstars you should include in your skincare routine. It keeps wrinkles away, firms your skin, fades dark spots and even treats sun damage. What more could a girl ask for?
A very informative post, indeed..
I agree on the last paragraph 🙂 Getting everything in moderate is way better.
.-= Shuu´s last blog ..Oh-My-Blush! Part 2: NYX Powder Blush Natural =-.
I like to use Vitiman C products (like Paul and Joe Whitening Serum) with Vitamin B3 products (Fair and Lovely or Olay Definity) to get more bang for the buck, too.
.-= Jamilla Camel´s last blog ..Latest Acquisitions: Tods Shoes and DSK Earrings =-.
This is rather interesting. There has always been much controversy of the benefits and efficacy of ingested vitamins versus topical vitamins. Take for example Collagen. We have collagen added to a number off our creams, salves and serums. In Japan and Asia they sell Collagen in drinks with the reasoning that collagen can not be absorbed into the deeper layers our of epidermis making the stuff you slap on your face almost useless. Meiji even goes to state that their marine based Collagen powder has a higher absorbency rate when mixed in with your drink. Is this true? Do they really work faster than topical solutions? Or do some vitamins, when ingested, go to other places than the ones you intend them for?
.-= Saintangelius´s last blog ..Absence makes the heart grow fonder… =-.
Shuu: that’s right, too much is usually never good. 🙂
Jamilla Camel: that’s a nice approach. Vitamin B3 has great benefits for the skin, including antioxidant properties. Using them together will probably enhance their benefits.
Saintangelius: Skin is designed to keep everything out and for this reason, despite what companies claim, ingredients applied topically usually stay on the surface of the skin, which is made of dead cells. Creams do moisturize and prevent water loss but that’s it. To do more, the ingredients will have to penetrate deep into the living cells of the skin and only very few substances can do that. That’s why it’s better to get vitamins, proteins and everything else our bodies need from food than a cream.
Vitamin C can penetrate deep into the skin but for it to do so, it has to be present in high concentrations in the product. If it is listed towards the end of the ingredient list, it won’t do anything. But if you eat an orange a day for example, your body will have all the Vitamin C it needs for collagen synthesis.
As for collagen, there is no proof that applying it on the skin has anti-aging benefits. It will moisturize the skin but nothing more. The same is true if you drink it. It may plump your skin a bit but won’t help with wrinkles.
I concur.
On the one hand, people do not realise that vitamin C is a water soluble vitamin and thus anything not used is excreted in urine, so it must be taken daily. On the other, it’s really really easy to get.
The RDA for vitamin C is 60mg a day, the average sized kiwi contains 48mg of vitamin C – well over half the daily recommended allowance. Of course, the RDA is a MINIMUM required for health and you can safely exceed it many times over.
Worth mentioning, however, that taking in amounts of vitamin C over 10,000mg a day has shown to contribute to the production of form radicals (like free radicals, but complete groups of oxidised cells) which are also a considerable health risk. So yes, all things in moderation. Personally I wouldn’t exceed 1000mg a day, but I’ve sold vit C to patients fighting cancer before who’ve taken 5000-8000mg daily.
.-= Anastasia´s last blog ..Sliced Bread Isn’t Actually All That Great =-.
Thank you for sharing Ana. I agree with you that too much Vitamin can cause damage. I’ve never been too worried about it as the body simply eliminates any excess, but then I’d never take that much! I would never recommend that, too much of a good thing is never good and may actually cause more harm.
When it comes to getting the right vitamins for your skin i feel it’s always a good idea to work from the inside out, most of the time it’s cheaper too, a combination of foods high in a vitamin plus a top up with supplements is affordable and will compliment the skincare products used.
Selenium is another good antioxidant.
.-= Beauty Able´s last blog ..Get Rid Of Blackheads With Pore Cleansing Strips =-.
I agree with you Beauty Able. I think the body benefits more getting vitamins by eating foods rich in them than from topical creams. It’s definitely cheaper considering that most skincare products don’t contain concentrations high enough to provide benefits for the skin.
Hi, I love your blog thanks for sharing so much information with us, I have a question, i’ve seen youtube videos of people making homemade vitamin c serums and i wonder if it really works since it needs to penetrate deep into the skin, i was thinking about buying one of those products that claim to have pure vitamin c, but they are so expensive for me, so i was hoping i could made my own serum, do you think it is worth it? thank you 🙂
Joscelyn, hi and thank you for your kind words. I’ve partially answered this question on the glycerin page, but basically I believe that, when it comes to Vitamin C, it’s better to spend a bit more and buy a product properly formulated with it rather than try to make your own. It’s very difficult to stabilize Vitamin C and, when unstable, it oxidizes (ie lose its effectiveness) really quickly. You would also need to use a concentration that’s high enough to penetrate the skin but not so high to cause irritations, which isn’t easy either. Hope this helps.
Hi! I just started reading your blog and I love it. It has given me a more informed idea of how to take care of my skin effectively. I do have some questions though. According to your blog posts, there are multiple products that you need to use on a daily basis. But is it safe or effective to use all of those products on a daily basis? Like a vitamin c serum, Retin A, alpha hydroxy acid, moisturizing cream, an antioxidant serum… Would you recommend using them all everyday? Do you have a blog post were you talk about your own skin care routine? Thank you!
Diana, that’s a very good question. My aim with this blog is to tell you what really works to treat all the various skin conditions. But what you end up using depends on several factors including your skin type, age, skin issues etc.
If you want to keep things really basic, you can use only these three products: http://www.beautifulwithbrains.com/essential-daily-skincare-products/ this is what I would recommend to a teen without acne as their skin is still in very good condition and doesn’t need much help.
What to add to that depends on your needs. If you’re concerned about anti aging, retinoids and alpha hydroxy acids certainly help. But I use them on alternate days. I’ve shared my skincare routine in this post: http://www.beautifulwithbrains.com/my-skincare-routine/