Best Vitamin C serums under £20 for 2026
Here’s my guide to the best Vitamin C serums under £10 and £20 for 2026 – the easiest way to get some of the good stuff into your skincare routine. It features a comprehensive round-up of 30 serums, so there’s something for just about everyone and every budget.
This article includes reviews of top reasonably-priced products, including the newest serum launches, high street bargains and Korean cult beauty treats. It also covers different types of Vitamin C, and affordable serums for different skin types and goals.
Those insane price tags are about to change!
In case you hadn’t already heard, the patent just expired on the famous Vitamin C serum that costs around £165 for a 30ml bottle (SkinCeuticals C E Ferulic). Yes, it gave impressive results to many customers, but it was a fairly simple formula and I don’t think it represented value for money for the average person.
Now the patent’s lapsed, nobody’s going to get sued for making a cheaper version. I think we’ll be seeing more and more Vitamin C skincare at sensible prices, so watch this space.
This in-depth look at the best cheap Vitamin C serums in the UK is divided into seven main sections. Click on the link to jump to a specific section, or scroll down and keep reading.
- Why use a Vitamin C serum? – reasons & benefits
- Ascorbic acid (pure) Vitamin C serums under £20
- 3-0-Ethyl Ascorbic Acid serums under £20
- Ascorbyl glucoside serums under £20
- Tetrahexyldecyl ascorbate serums under £20
- Sodium ascorbyl phosphate serums under £20
- Mixed Vitamin C serums under £20
If you’re wondering what all the fuss is about, or which type of Vitamin C is best for you, read on.
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Why use a Vitamin C serum?
There are multiple benefits to be gained from using Vitamin C serums. For starters, it’s a powerful antioxidant, protecting your skin from free radicals and helping prevent sun damage (when combined with sunscreen).
Vitamin C serums can also make existing sun damage and uneven blotches of pigment less visible on the skin’s surface, contributing to a ‘brightening’ effect. Some forms of Vitamin C may help boost skin’s collagen levels, preventing premature ageing.
How long does Vitamin C serum take to work?
You get an antioxidant effect right from the first time you use it. For hyperpigmentation like sun spots and post-acne marks, it takes 4-6 weeks for early results and 12+ weeks for full effects, combined with SPF.
Collagen boosting benefits come after several weeks / months of diligent use. This has been seen with high concentrations of L-ascorbic acid.
Does Vitamin C serum smell strange?
Yes, most ascorbic acid based Vitamin C serums have a natural smell, especially the C-E-ferulic ones. Some people describe it as the smell of old copper pennies or bonfire smoke. The scent fades away soon after application, but can take some getting used to. Many beauty companies add artificial fragrance, but it can upset sensitive skin.
Ascorbic acid (pure) Vitamin C serums under £20
Ascorbic acid, also called L-ascorbic acid, is the pure form of Vitamin C. It’s generally found in 10-20% concentrations in effective serums, and has various pros and cons.
Pros of ascorbic acid serums
- Best researched form of Vitamin C.
- The strongest type of Vitamin C.
- Widest range of proven benefits for skin health.
Cons of ascorbic acid serums
- Very unstable – easily broken down by light, heat and contact with air.
- Most people find it tingles when they start using it.
- Can cause rashes, sensitivity and acne flare-ups.
- Some people can’t tolerate it at all.
- Can stain hands, face or pillow cases.
And now, on to look at some of my favourite sub-£20 ascorbic acid Vitamin C serum finds and picks, starting with two of the strongest.
Dermatica Vitamin C 15%: Fresh Batch Ascorbic Acid 12.5ml | £15.50 / £11.99
Science-led skincare brand Dermatica sells a 15% Vitamin C product that’s made fresh every month. I’d describe this one more as a light textured cream than a watery serum. Can buy as a one-off to try without being a subscriber.
This is well made with lots of extras including glycerin, ceramides, hyaluronic acid, ferulic acid, panthenol and more. NB: only 12.5ml per bottle, but gives most people a month of regular use and a little goes a long way.
BUY HERE >> Dermatica
PG’s Tip: If you subscribe, the price comes down to £11.99 per month. Cancel any time.
Geek & Gorgeous C-Glow 30ml | £11.95
Biggest seller from a company that’s relatively new to the UK, and it’s a real bargain. The water-light serum contains 15% ascorbic acid, plus ferulic acid and Vitamin E to stabilise and increase effectiveness. The formula’s similar to a certain (overpriced!) cult beauty product that costs £165 a bottle, and will work in the same way.
The light texture means it can be layered under all kinds of different products, and if you keep it in the fridge it should last up to three months. Fragrance and alcohol free.
BUY HERE >> Geek & Gorgeous UK, Amazon UK, Superdrug (in store only)
PG’s Tip: Geek & Gorgeous sell an empty 10ml sized mini bottle on their website – decant a week’s worth into it from the fridge, and stick it in your bathroom cabinet.
A few other L-ascorbic acid serums in the under £20 category:
L’Oreal Paris Men Expert Hydra Energetic 10% Vitamin C Serum 30ml | £19.99
You don’t have to be a man to use this serum. This light, non-greasy serum contains 10% ascorbic acid, a decent amount. Also has adenosine, peptides, sodium hyaluronate and vitamin E to boost the skin. Contains some denatured alcohol and fragrance.
BUY HERE >> Boots, Superdrug, LookFantastic, Tesco, ASOS
PG’s Tip: Regularly turns up in half price offers on the high street, and £10 per bottle is a nice price.
Garnier Vitamin C Brightening Night Serum 30ml | £14.99
Another serum containing 10% pure ascorbic acid, enough to give obvious results in a few weeks. Includes glycerin, adenosine, sodium hyaluronate and a little salicylic acid as beneficial ingredients.
You could probably use it during the day too, even though it says ‘night’ on the bottle. Absorbs easily. Contains perfume.
BUY HERE >> Superdrug, Amazon UK, Boots, LookFantastic
PG’s Tip: In regular half price deals around payday weekends and bank holidays.
PG’s Tip #2: Sometimes listed as ‘Garnier Targeted Anti Dark Spot Night Serum for Face’.
Purito Pure Vitamin C Serum 60ml | RRP £18.00
Korean skincare serum with 5% ascorbic acid, might be a nice place to start if you’re trying the pure form of this ingredient for the first time. Gives antioxidant protection and a slower general brightening effect. Big 60ml bottle, lasts up to three months.
Light serum also contains sodium hyaluronate, adenosine, and a small amount of niacinamide. Fragrance free and cruelty free.
BUY HERE >> Amazon UK, Boots, Sephora UK
PG’s Tip: Regularly turns up in offers, so you can pick up one for around £11 or so if you’re prepared to wait.
PG’s Tips for L-ascorbic acid use
A few important things to keep in mind:
- Only buy ascorbic acid products that are freshly made, from reputable retailers with fast turnover of stock.
- Keep it in the fridge if you can, tightly sealed.
- If the serum turns dark yellow or brown it’s gone off – bin it.
- Always do a patch test and build up use slowly.
- Wash your hands thoroughly after applying to prevent staining.
- Wear sunscreen over it in daytime.
3-0-Ethyl Ascorbic Acid Vitamin C serums under £20
This more stable form of Vitamin C, also called Ethyl Ascorbic Acid, is both water-soluble and oil-soluble. It’s thought to give the same benefits as ascorbic acid, although there is less research.
Doesn’t need to be used in large amounts due to its stability, often found in the range of 0.5% to 5% in skincare. You don’t need to keep it in the fridge.
Here are some low priced options for you, starting with the strongest:
Minimalist Vitamin C + E + Ferulic 16% 20ml | £11.99
Vitamin C serum from Minimalist that’s fairly strong. The name is slightly confusing: it’s actually 15% 3-0-ethyl ascorbic acid plus a 1% mixture of Vitamin E and ferulic acid. You only get 20ml but the price per ml is still low. Fragrance free.
BUY HERE >> Amazon UK, Debenhams, Superdrug (Marketplace), Holland & Barrett
PG’s Tip: They also make a gentler 10% Vitamin C serum, 30ml, for more sensitive skin. Includes soothing centella, acetyl glucosamine, sodium hyaluronate and PHA (gluconolactone). Find at Amazon UK.
Boots Modern Chemistry Glow 10% Vitamin C & Ferulic Serum 30ml | £11.00
A newer offering from the high street chemist, this is a very simple serum with a thicker texture. No whistles and bells, but a strong formula for £11. Maybe trying to compete with The Ordinary, who don’t have a 3-0-Ethyl ascorbic acid serum. Fragrance free (but does have that natural smoky smell).
BUY HERE >> Boots
Beauty of Joseon Light On Serum 30ml | £15.00
Korean serum containing 10% 3-0-Ethyl ascorbic acid, plus several soothing ingredients including centella asiatica (‘cica’), panthenol and beta-glucan. Also includes adenosine and hyaluronic acid. Most users find it gentle, one to try if you have sensitive skin.
BUY HERE >> Space NK, Boots, LookFantastic
Ascorbyl glucoside Vitamin C serums under £20
Ascorbyl glucoside is a water soluble derivative of ascorbic acid. About 2% to 5%+ concentration is needed to improve pigmentation.
Pros of ascorbyl glucoside
- Relatively gentle, stable form of Vitamin C.
- Can be safely combined with niacinamide.
- Formulas don’t need to be strongly acidic to work.
- Gets into the skin easily.
Cons of ascorbyl glucoside
- Not as strong as ascorbic acid.
- Not as well researched as ascorbic acid.
- More for brightening than collagen building.
Now let’s look at some affordable and popular ascorbyl glucoside serums:
The Inkey List 15% Vitamin C + EGF Serum | £15.99
Lightweight serum containing 15% ascorbyl glucoside and 1% plant-based Oligopeptide-1, also known as Epidermal Growth Factor. Gentle and non-greasy with pleasant texture that layers well with other products, making it hugely popular. Regularly in offers. Vegan and fragrance free.
Buy here >> Boots, Sephora UK, LookFantastic, The Inkey List
No7 Radiance+ 15% Vitamin C Serum 25ml | RRP £19.95
Contains a generous amount amount of ascorbyl glucoside Vitamin C, and has plenty of ‘slip’ which makes it easy to apply a thin layer. Also has sodium hyaluronate plus soothing allantoin. You only get 25ml though. Contains perfume. It’s very popular, and regularly on offer at Boots.
Buy here >> Boots
The Ordinary Ascorbyl Glucoside Solution 12% 30ml | RRP £14.10
Popular water-based serum with one active ingredient and not much else. Works well for brightening, and gentle on skin. Like many The Ordinary products, I find this serum a bit ‘goopy’. However, it’s cost effective, so if the only thing your skincare routine needs is some non-irritating Vitamin C then this might be the one. Fragrance free, cruelty free.
Buy here >> Boots, CultBeauty, The Ordinary
Boots Botanics All Bright Serum 25ml | £8.99
A cheap and cheerful serum containing a moderate amount of ascorbyl glucoside, hyaluronic acid and some plant extracts. Enough for gentle brightening and comes in well under a tenner. Contains perfume, cruelty free.
BUY HERE >> Boots
Tetrahexyldecyl ascorbate serums under £20
Tetrahexyldecyl ascorbate, also called THDC and/or ascorbyl tetraisopalmitate, is found in the popular but expensive C-Tetra serums from Medik8. It’s an oil-based Vitamin C derivative with good stability, best for normal to dry skin types.
Here are three options under £20 for you:
The Ordinary Ascorbyl Tetraisopalmitate 20% in Vitamin F | £19.50
A very plain oil-based formula with a high concentration of stable Vitamin C. No interesting extra ingredients, but it’s moisturising and popular with people with drier and more sensitive skin types. By the way ‘Vitamin F’ is just a pair of fatty acids, it’s not really a vitamin. Cruelty free, fragrance free.
BUY HERE >> The Ordinary, Amazon UK, LookFantastic
Superdrug Me+ Vitamin C with Squalane Booster 30ml | £12.00
Simple and quite rich oil-based serum with 2% Ascorbyl Tetraisopalmitate, wheatgerm oil and two types of Vitamin E. A relatively low dose, but will work as a gentle antioxidant in a moisturising base. Regularly on offer, so you can often pick it up for £8.00 per bottle. Vegan, fragrance free.
BUY HERE >> Superdrug
VitaSkin Vitamin C Intense Illuminating Oil 30ml | £19.50
From Holland & Barrett’s own-brand skincare range. They don’t say how much Tetrahexyldecyl Ascorbate is in this, but it’s third on the ingredients list after moisturising squalane and kiwi seed oil so it’s likely to be an effective amount. Vegan, has added fragrance.
BUY HERE >> Holland & Barrett
Sodium Ascorbyl Phosphate serums
I’m a huge fan of sodium ascorbyl phosphate, or SAP, especially when my skin is feeling more sensitive than usual, or threatening to break out. Lots to choose from here, so let’s start by quickly looking at the pros and cons.
Pros of sodium ascorbyl phosphate (SAP)
- One of the most stable forms of Vitamin C.
- Super gentle, so a good one for sensitive skin, or newbies.
- Has an anti-bacterial and anti-acne action.
Cons of sodium ascorbyl phosphate
- It doesn’t absorb deep into the skin, and it’s mainly used for surface benefits.
- Not as strong in its effects as pure ascorbic acid.
Now let’s look at the best value SAP vitamin C serums under £20:
Bubble Skincare Day Dream Vitamin C + Niacinamide Serum 30ml | £18.00
The fun Australian brand has a serum that should work for most skin types. Contains a generous amount of SAP Vitamin C, alpha arbutin, niacinamide, five types of ceramide, glycerin, and soothing/brightening licorice extract.
Cruelty free, no fragrance. The packaging protects against light and air degradation, even if it doesn’t look all that sleek.
BUY HERE >> Boots, Amazon UK, ASOS
Superdrug Skin Brighten & Glow Serum 50ml | £5.00
A simple but effective serum containing sodium ascorbyl phosphate Vitamin C, plus glycerin and antioxidant extracts of kakadu plum and goji berry. Big 50ml bottle and very low price, lasts for ages and has lots of dedicated fans. Contains perfume, cruelty free.
BUY HERE >> Superdrug
PG’s Tip: Often in 1/3-off deals, bringing the price down to just £3.33 for a big 50ml bottle.
And now four more affordable SAP Vitamin C serums under £20 and £10:
Balance Active Formula 12% Vitamin C Supershot 30ml | RRP £7.99
A 12% concentration of sodium ascorbyl phosphate, which is relatively high, in a very simple serum base with a small amount of lactic acid. Should brighten the complexion and reduce dark spots. Plays well under other skincare. Fragrance free, cruelty free.
Buy here >> Amazon
Simple Glow+ Booster Serum 10% Vitamin C+E+F 30ml | RRP 9.99
Moisturising emulsion serum with confusing name. The ‘10%’ is 2% sodium ascorbyl phosphate + 1% vitamin E acetate + ‘7% Vitamin F’ (which is just hemp oil fatty acids). Fragrance free, vegan, best for dry or very dry sensitive skin. Regularly on discount.
Buy here >> Superdrug, Amazon UK, Boots
Nature Spell Vitamin C Brightening Face Serum 30ml | £8.00
An affordable sodium ascorbyl phosphate vitamin C serum that also includes niacinamide, a little lactic acid and liquorice root extract. The colour comes from caramel rather than oxidation. Contains perfume.
BUY HERE >> Holland & Barrett, Nature Spell, Amazon UK
VitaSkin Vitamin C Collagen Boosting Serum 30ml | £19.50
H&B own-brand. Simple formula with sodium ascorbyl phosphate, plus vitamin E and sodium hyaluronate. Can it boost collagen? Probably not, but should give protection and surface brightening over time. Vegan. Contains fragrance. Often ‘buy 1 get 1 free’, bringing price per bottle under £10. Wait for offers!
BUY HERE >> Holland & Barrett
Great value multi-Vitamin-C serums under £20
Some serums contain two or more different types of vitamin C to combine various benefits. Here are a few reasonably priced ones that you might be interested in, including some hot new releases.
e.l.f. Skin Bright Icon Vitamin C & E + Ferulic Serum 30ml | £16.99
Latest serum from e.l.f. Pretty strong Vitamin C serum with 3-0-Ethyl ascorbic acid and L-ascorbic acid high up the ingredients list, plus nice supporting ingredients (glycerin, Vitamin E, panthenol, ferulic acid, bisabolol and sea buckthorn oil). Perfume free, cruelty free, but does have that smoky ‘Vitamin C’ smell.
BUY HERE >> e.l.f. UK, Boots, Superdrug
PG’s Tip: They also sell a mini bottle 15ml version for £9, so you could test a smaller one and see how you get on.
Superdrug Me+ 10% Vitamin C Extra Strength Booster 30ml | £12.99
The 10% in the name is a combination of decent amounts of Sodium Ascorbyl Phosphate and 3-O-Ethyl Ascorbic Acid, plus a little Ascorbyl Glucoside, so you’re getting three types of Vitamin C in one serum. Also contains ferulic acid for more of a boost.
Suitable for most skin types, and designed for brightening and protecting skin. You only need two or three drops for the whole face. Fragrance free, cruelty free.
BUY HERE >> Superdrug
PG’s Tip: Regularly turns up in special offers for a third or more off, bringing price per bottle below £10.00.
PG’s Tip #2: Wrongly categorised as ‘face oil’ on their website – rest assured it’s actually water based.
Skin + Me Vitamin C serums 15ml | £19.99
The prescription skincare company has two very nicely formulated powerful off-the-shelf Vitamin C serums. Brighten + Boost Firming Vitamin C Serum is designed to target fine lines and wrinkles. Contains 3-O-Ethyl Ascorbic Acid, L-Ascorbic Acid, Palmitoyl Tetrapeptide-7, Palmitoyl Tripeptide-1 & Acetyl Hexapeptide-8.
The second, Brighten + Boost Regulating Vitamin C Serum, is for dark spots and unwanted pigmentation. It contains the same Vitamin Cs as the other serum, plus Acetyl hexapeptide-1 to even skintone and minimise dark spots. Both are fragrance free.
BUY HERE >> Skin + Me Firming Serum and/ or Skin + Me Brightening Serum
PG’s Tip: Their prescription skincare subscriptions are excellent, if you’re looking for clinical solutions for your skin. [This link gets you the first month for £4.99.]
Naturium Vitamin C Complex Serum 15ml & 30ml | from £13
Very nice gentle serum with sodium ascorbyl phosphate and L-ascorbic acid, plus fruit extracts. Also has glycerin, glutathione, aloe vera, beta-glucan and Vitamin E acetate for extra support. Medium thickness gel spreads easily and feels luxurious for the price. Should give steady results over 8 to 12 weeks of use.
PG’s Tip: You can try the smaller bottle to see how you get on with this serum. It’s also good for travel.
PG’s Tip #2: The big bottle ends up in lots of SpaceNK discount deals such as 25% off, bringing it well under £20.
Nip + Fab C-Fix 5% Serum 50ml | £19.95
Upgraded formula of their best-selling NIP + FAB serum. Contains sodium ascorbyl phosphate, ascorbyl glucoside and 3-0-Ethyl ascorbic acid that adds up to a total of 5%. Includes ferulic acid, allantoin, niacinamide, Vitamin E and sodium hyaluronate. Generous 50ml size. Contains perfume.
BUY HERE >> LookFantastic, Boots, and NIP + FAB
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That’s it for the best Vitamin C serums under £20 for 2026, which also includes some great value serums under £10.
Let me know if you have any questions or favourite products – leave a message in the comments section below.
