Pro-Helix C
Pro-Helix C
Collagen Peptide Brightening Serum
5.0 / 5.0
(18) 18 total reviews
Targets skin’s lost elasticity for firmer, brighter skin.
A luxurious milky serum that goes beyond typical vitamin C. In a single morning step, discover clinically proven brightening from the first application with cellular renewal for firmer, more elastic skin. In a pH neutral formula; gentle enough for sensitive skin.
- Immediate & lasting radiance: Clinically proven to increase skin brightness.
- Visibly reduces fine lines & wrinkles: Reduction in the appearance of fine lines and wrinkles in 7 days.
- Restores skin firmness: Increase in elastic fibres in cellular testing.
- Suitable for sensitive skin: Dermatologically approved pH neutral formula.

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Pro-Helix C
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KEY BENEFITS
Brighter, More Radiant Skin
Clinically proven to deliver an immediate boost to skin brightness. 94% showed brighter skin within 7 days.[1]Reduces Fine Lines & Wrinkles
Clinically proven to reduce visible fine lines and wrinkles in as little as 7 days[2]Improves Skin Firmness & Elasticity
Human skin biopsy study showed a significant increase in elastic fibres. 87% of participants said their skin appeared firmer and more plump after four weeks of use.[3]Protects Collagen
2.4x boost in key antioxidant defence. Helping protect collagen from environmental stressors.[4]View Citations
"We have evidence of a measurable structural change within human skin, and that's where the story becomes quite different from a conventional vitamin C serum."
Dr. Clare Kiely
CONSULTANT DERMATOLOGIST
SWITCH ON MORE THAN GLOW
Proven Results
Rigorously tested across all three dimensions of our Cell-to-Surface™ standard
BEFORE
AFTER 4 WEEKS
BEFORE
AFTER 8 WEEKS
BEFORE
AFTER 8 WEEKS
BASELINE
PRO-HELIX C AFTER BIOPSY
SEE THE DIFFERENCE RESULTS BEYOND VITAMIN C
TESTED AT THE CELL
MEASURED AT THE SURFACE
PERCEIVED IN THE MIRROR
Pro-Helix C
1. Tested at the Cellular Level
The Manchester Patch Test Assay & Spatial Transcriptomics
The Process
Manchester Patch Test Assay:
Intra-subject controlled, double-blinded study on human volunteers with skin biopsies taken and biomarkers examined under microscope. Validated & bench-marked against prescription product.
Spatial Transcriptomics:
After the patch test, the skin biopsies from treated and untreated sites are sliced wafer-thin and placed in the Xenium machine. It tags and images the RNA for 300 genes to show which genes switched on, in which cells, and exactly where in the skin.
The Purpose
Manchester Patch Test Assay:
Rapidly models 6 months of use on live human skin.
Spatial Transcriptomics:
Provides a precise map of how the product changed skin biology at the cellular level.
The Result
- Scientifically proven to increase fibrillin deposition in human skin
- 32% higher relative P4HA2 transcript abundance in superficial fibroblasts; increased in 5/5 donors in spatial transcriptomics
- Approximately 2.4-fold higher expression of the antioxidant enzyme gene SOD3 in spatial transcriptomics.
2. Measured on the Surface
Clinical Trial
The Process
32 people have baseline professional Visioscan & Skin Gloss Metre in controlled conditions to measure wrinkle depth & brightness, images are taken before using the product, at 7 days, 28 days and 56 days. Computer-measurements are taken and compared to the baseline.
The Purpose
A good study to see if visual improvements are obtained from use of the product.
The Results
- Clinically proven to reduce the appearance of fine lines & wrinkles from day 7
- Clinically proven to deliver an immediate boost to skin radiance maintained at 56 days
3. Perceived in the Mirror
Consumer Trial
The Process
45 people are provided with the product to use for 28 days, volunteers are asked questions about their experience at 0, 7 days, and 28 days.
The Purpose
This study is useful to understand volunteers' experience from product use, while it lacks rigorous scientific credentials, it helps to ensure that a person's experience aligns with the scientific results.
The Results
- 91% experienced brighter skin within 7 days.
- 87% said skin appeared firmer and more plump after use.
- 73% said they would switch from their current vitamin C product.
Why Switch From Your Current Vitamin C Serum?
Pro-Helix C goes beyond glow alone
Improves Brightness L-Ascorbic Acid (Gold Standard): YesPro-Helix C: Yes
94% of Pro-Helix C clinical trial participants showed brighter skin within 7 days
Protects Collagen L-Ascorbic Acid (Gold Standard): YesPro-Helix C: Yes
Vitamin C contributes to normal collagen formation for the normal function of the skin.
Provides Antioxidant Protection L-Ascorbic Acid (Gold Standard): YesPro-Helix C: Yes
Vitamin C is the most plentiful antioxidant in human skin. It protects against environmental stressors by donating electrons to neutralise free radicals. Pro-Helix C takes this further showing a 2.4x boost in key antioxidant defence signals created by the body.
Increases Elastic Fibres for Visibly Firmer Skin L-Ascorbic Acid (Gold Standard): NoPro-Helix C: Yes
In a human skin biopsy study, Pro-Helix C showed a significant increase in elastic fibres, namely fibrillin.
Formulated for Sensitive Skin L-Ascorbic Acid (Gold Standard): NoPro-Helix C: Yes
Pro-Helix C uses a combination of THDA vitamin C and acetyl-zingerone to create a lipid-soluble form of vitamin C that is stable. This means we have been able to formulate the product at a neutral pH with no added fragrance, which doesn't cause irritation to sensitive skin and doesn’t block pores.
Powered by Collagen-Signalling Peptides L-Ascorbic Acid (Gold Standard): NoPro-Helix C: Yes
Pro-Helix C combines two peptides: one that signals collagen repair and another that switches on the growth-factor pathway directly for firmer, more elastic skin.
More Than Vitamin C.
15% THDA Vitamin C
The lipid-soluble form. Highly stable, well tolerated, and it penetrates properly rather than sitting on the skin's surface.
4.5% Dual Peptide Complex
Two complementary signals telling your skin to build new collagen - not just protect the old.
0.5% Acetyl Zingerone
The bodyguard. Most antioxidants are depleted the moment they neutralise a free radical. This one keeps going; protecting your collagen for hours after you apply it.
View the full INCI
Aqua, Tetrahexyldecyl Ascorbate, Glycerin, Dipropylene Glycol, Simmondsia Chinensis (Jojoba) Seed Oil, Dicaprylyl Ether, Maltodextrin, Glycine Soja (Soybean) Seed Extract, Acetyl Zingerone, Palmitoyl Tripeptide-5, Collagen Amino Acids, Squalane, Tocopheryl Acetate, Sodium Hyaluronate, Lecithin, Ethylhexylglycerin[1], Sorbitan Isostearate, Hydroxyethyl Acrylate/Sodium, Acryloyldimethyl Taurate Copolymer, Sodium Acrylates Copolymer, Polysorbate 60, Phenoxyethanol, Citric Acid
DEEP RESULTS TAKE TIME TO BUILD
What to Expect
1 Week
Within 1 week, your skin will appear more radiant with a healthy-looking glow.
1 Month
By 1 month of continued use, you will start to see early visible improvements. Your complexion appears brighter, more even and refreshed. Daily antioxidant support helps defend against environmental stressors that can contribute to dullness and uneven skin tone.
3 Months
By 3 months your skin is building resilience so it feels firmer and smoother. Fine lines appear less noticeable, while the complexion looks visibly plumper and more luminous.
6 Months
As 6 months of use come around, you'll feel and see the full cumulative effects: skin appears noticeably firmer and more elastic, with improved overall radiance and more even-looking tone. Your complexion looks healthier, brighter and more youthful.
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FAQs
How to Use
Apply evenly to the whole face every morning before your sunscreen.
What texture is it?
Pro-Helix C is a lightweight, fast-absorbing milky serum texture that layers seamlessly with sunscreen and makeup.
Does it cause irritation?
No. Pro-Helix C has been dermatologically tested and approved. Clinically proven non-comedogenic. Suitable for even sensitive skin.
How long will it take to see results?
Consistency is key with any topical skincare product. So it's important to commit to daily use for best results.
Within 1 week, your skin will appear more radiant with a healthy-looking glow.
By 1 month of continued use, you will start to see early visible improvements.Your complexion appears brighter, more even and refreshed. Daily antioxidant support helps defend against environmental stressors that can contribute to dullness and uneven skin tone.
By 3 months your skin is building resilience so it feels firmer and smoother. Fine lines appear less noticeable, while the complexion looks visibly plumper and more luminous.
As 6 months of use come around, you'll feel and see the full cumulative effects: skin appears noticeably firmer and more elastic, with improved overall radiance and more even-looking tone. Your complexion looks healthier, brighter and more youthful.
- 5 stars: 18 (100%)
- 4 stars: 0 (0%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 star: 0 (0%)
I’ve been using skin diary day and night creams for the last 9 months. Recommend to me by my skin Aesthetic professional. Was so happy to see the vitamin C product - pro helix C was becoming available. This was the product I felt was missing from my skin regime.
I have used the 3 day pro-helix trial and found this to feel lovely on my skin no irritation whatsoever just an extra glow which is just what I want from my skin care products. This will definitely will be part of my daily routine. Thank you ☺️
As a big fan of Skin Diary products, I was delighted to try a sample of the new vitamin C product. It was lovely to apply, very smooth and left a lovely glow on my skin. Looking forward to adding it to my regular Skin Diary routine.
Amazing product. It feels and smells great. Very light and is absorbed instantly. I’ve only been using for a very short time but I’m sure I can see a difference in my complexion already. Lovely
I really like this serum.. it’s light, easily absorbed and non sticky like other brands. I am only using it a short time but I can already feel the difference.
I have just started using new pro helix. It has a beautiful light texture and is easily absorbed. I love all the skin diary products. It has become my regular night and morning routine
Vitamin C is so important to the skin and this new product looks to deliver exactly what it says.
Thanks skin diary.
Love it , a smooth easy to apply texture. I have very sensitive skin and had absolute no irritation. I would highly recommend.
So far, I’ve only used the sample but already I prefer the texture to my current, oily Vitamin C.
I plan to order as I love my Skin Diary night cream so much. Hoping for great results.
It’s my first day using it but what I can say is that the texture is lovely and it sinks in really well, quite different from my previous, more oil-based vitamin C serum. The smell is amazing too. Well done Skin Diary!
Having used a lot of vitamin C products, this is one of my favourites. The product is a light creamy texture and easy absorbed. I have dry skin and this sunk in nicely, without an oily residue. It also has a pleasant smell. The serum doesn't pull under other products or make up. After a few weeks of use my skin was more even and luminous, even though this was over the summer months when even with use of sunscreen my skin normally colours a little. Dark spots were noticeably lighter and with continued use, continued to improve. A really nice effective product.
I have been looking for a great Vitamin C serum and am hoping I’ve found it with this one from Skin Diary. The texture is lovely and creamy - not sticky like a lot of vitamin c serums/drops.
My skin seemed instantly brighter and am hoping this might become my go-to vitamin C!
What a gorgeous new vitamin C product, love the texture, love how it melts into the skin and can already see a glow after short term use.
I’m writing this having only used the three day trial so can’t comment on its effectiveness over time but I’ve loved using it. I’ve often avoided using skin creams during the day as my skin is quite oily and they can feel uncomfortable and rather ‘de trop’ even though I do know I need them. This was lovely to apply, it felt like it wasn’t even there, and best of all it actually made my skin look good from the moment I put it on. I’ll definitely be buying a full bottle of this today and many more in the future ❤️
It has such a wonderful texture that glides on to skin, not like other vitamin C serums which tend to be quite watery. It gave a smooth texture and I noticed much better hydration during the day. I'll definitely be buying more!
I enjoyed using this product. It felt very smooth on my skin and definitely seemed to reduce some of my pigmentation. It worked very well under my foundation. I enjoyed using it in the morning before the moisturiser. I would definitely recommend it.
I enjoyed using the Pro Helix C. I felt my skin was smooth and bright. It was incredibly easy to use and layered well under moisturiser and SPF.
I thoroughly recommend.
I am so impressed with skin diary products and very excited to try the new vitamin c. This product is lovely to apply and didn’t irritate my skin like other similar products. I and others noticed a difference in my skin texture. Plus I know the robust science behind all products. Well done to Skin Diary.
It’s an excellent product that feels beneficial for the skin.
Smoothing on with a non-cloying richness it provides an even base for moisturiser and foundation.
I have tried so many vitamin c serums & creams, either too tacky or never absorbed into my skin. I absolutely love the creamy texture of this vitamin c & the glow that it gives every morning. It sits well under my makeup too