# Medik8 C-Tetra Serum for combination skin

**Lovi Fit: Average fit for combination skin.**
Combination Skin Fit: High · Effectiveness: Average · Safety: High.

Page: https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/combination-skin

The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Australia.

Brand: [Medik8](https://lovi.care/skincare/au/brands/medik8)
Category: [Serums and treatments](https://lovi.care/skincare/au/best/serums)

This fit is calculated for the concerns frequently associated with combination skin: an oily T-zone, enlarged pores, and dry cheeks. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

Works for combination skin; other serums fit it better.

## Why this fit

- Offers moderate suitability for your combination skin as tetrahexyldecyl ascorbate provides antioxidant protection and jojoba seed oil offers emollient action, though these benefits are not directly targeted at your oily shine.
- Grapefruit peel oil contributes mild antioxidant effects, offering general skincare benefits that are supportive rather than primary for your specific concerns.
- The product is safe for your combination skin, with no risks of irritation due to the absence of prohibited or harsh ingredients.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/oily-skin): Average
- [Dry skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/dry-skin): Average
- [Combination skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/combination-skin): Average (this page)
- [Sensitive skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/sensitive-skin): Average
- [Acne-prone skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/acne-prone-skin): Low
- [Skin with dark spots](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/dark-spots): Average
- [Mature skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/mature-skin): Average
- [Dry sensitive skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/dry-sensitive-skin): Average
- [Oily acne-prone skin](https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/oily-acne-prone-skin): Average

## Key ingredients

Tetrahexyldecyl Ascorbate Lipid Vitamin C, Jojoba Seed Oil, Tocopheryl Acetate Vitamin E, Grapefruit Peel Oil, Ppg-12 Smdi Copolymer

## What the research says

- A 3-in-1 anti-aging topical night serum-in-oil applied once daily decreased wrinkles by 11%, increased skin firmness by 8%, reduced redness by 70%, and improved overall skin quality and complexion in 103 female subjects over 28 to 84 days compared to baseline. ([Journal of Cosmetic Dermatology, 2019](https://pubmed.ncbi.nlm.nih.gov/30924254/))
- Dermatological products containing d-alpha tocopheryl acetate showed non-comedogenic potential with less than a 50% increase in microcomedones in 12 healthy male subjects compared to octyl palmitate. ([Contemporary Clinical Trials Communications, 2021](https://pubmed.ncbi.nlm.nih.gov/34471722/))
- Topical application of 5% vitamin C cream significantly improved global clinical scores, increased skin microrelief density, and induced elastic tissue repair in photoaged skin compared to excipient control in healthy female volunteers. ([Experimental Dermatology, 2003](https://pubmed.ncbi.nlm.nih.gov/12823436/))
- Ascorbic acid 2-glucoside gel significantly reduced gingival melanin pigmentation after 4 weeks compared to placebo in 73 subjects with symmetric pigmentation. ([Journal of Periodontology, 2009](https://pubmed.ncbi.nlm.nih.gov/19186973/))
- Topical application of VC-IP cream twice daily for 8 weeks reduces periorbital wrinkles in female subjects compared to a placebo cream. ([Journal of Cosmetic Dermatology, 2022](https://pubmed.ncbi.nlm.nih.gov/34910367/))
- Clay jojoba oil facial masks reduced total skin lesions by a mean of 54% after 6 weeks in 133 participants with acne-prone, lesioned skin and mild acne compared to baseline. ([Forschende Komplementarmedizin, 2012](https://pubmed.ncbi.nlm.nih.gov/22585103/))
- Topical application of jojoba wax reduced LPS-induced secretion of IL-6, IL-8, and TNFα by approximately 30% and increased the synthesis of pro-collagen III and hyaluronic acid compared to untreated skin in an ex-vivo human skin organ culture model. ([Frontiers in Pharmacology, 2024](https://pubmed.ncbi.nlm.nih.gov/38344180/))
- Topical jojoba oil application in male mice decreased exercise-induced pro-inflammatory gene expression (Il-1b and Il-6 in soleus, Il-1b in gastrocnemius) compared to untreated exercised mice. ([Biomolecules, 2025](https://pubmed.ncbi.nlm.nih.gov/41154623/))
- Topical application of an antioxidant serum containing 15% ascorbic acid, 0.5% ferulic acid, and 1% tocopherol prevented particulate matter-induced degradation of extracellular matrix components, inflammation, and oxidative stress in the skin of 15 female volunteers compared to untreated controls. ([Journal of Cosmetic Dermatology, 2025](https://pubmed.ncbi.nlm.nih.gov/40642809/))
- Topical application of an antioxidant mix containing 15% ascorbic acid, 0.5% ferulic acid, and 1% tocopherol prevented PM and UV-induced skin barrier perturbation, lipid peroxidation, inflammatory markers, MMP9 activation, and Type I collagen loss in 15 healthy females compared to untreated exposed skin. ([Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38590207/))
- A topical antioxidant serum significantly reduced air pollution-induced skin pigmentation and proinflammatory gene expression ex vivo, and improved skin aging signs in 40 healthy adult females after 90 days of daily use. ([Journal of Cosmetic Dermatology, 2022](https://pubmed.ncbi.nlm.nih.gov/35150043/))
- A novel D-limonene and Gelucire 44/12 based microemulsion formulated with Labrasol and Labrafil M 1944 CS showed high stability, optical transparency, nanometric globule size, and a safe in vivo skin profile on mice ear skin. ([Advanced Pharmaceutical Bulletin, 2021](https://pubmed.ncbi.nlm.nih.gov/33880349/))
- Topical application of d-Limonene and perillyl alcohol reduced the severity of TPA-induced skin lesions, lowered serum IL-6 and TNF-alpha concentrations, inhibited P-selectin expression, and improved tissue regeneration associated with reduced neovascularization in murine models. ([Anti-inflammatory & Anti-allergy Agents in Medicinal Chemistry, 2014](https://pubmed.ncbi.nlm.nih.gov/24160248/))
- Grapefruit essential oil promoted HaCaT cell proliferation, reduced ROS production, inhibited IL-1 and COX-2 expression, and recovered LOR and FLG contents in a cell damage model of skin inflammation stimulated by S. aureus metabolites compared to lime essential oil. ([Chemistry & Biodiversity, 2022](https://pubmed.ncbi.nlm.nih.gov/35505451/))

## Why other serums fit combination skin better

- Niacinamide and ferulic acid incorporated in a stable multiple emulsion successfully reduced melanin, sebum, and skin erythema while improving skin elasticity and hydration in human skin compared to a placebo. ([BioMed Research International, 2022](https://pubmed.ncbi.nlm.nih.gov/35342760/))
- A panthenol-enriched mask improved skin hydration, regulated sebum, and reduced redness and TEWL across dry sensitive, oily sensitive, and oily acne skin subgroups with excellent tolerance and no adverse reactions. ([Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38366684/))

## What reviewers say

This serum is widely praised as an excellent entry-level Vitamin C product, particularly for those with sensitive or dry skin due to its gentle, non-irritating formula. Users consistently report a noticeable "healthy glow" and improved hydration, though those with oily or acne-prone skin sometimes find the oil-based texture too heavy or congestion-inducing.

- Liked: Gentle & Non-irritating (mostly mentioned)
- Liked: Brightening & Glow (often mentioned)
- Liked: Hydrating Texture (sometimes noted)
- Liked: Pleasant Scent (sometimes noted)
- Disliked: High Price Point (sometimes noted)
- Disliked: Oily/Greasy Feel (sometimes noted)
- Disliked: Caused Breakouts (rarely noted)
- Disliked: Lack of Potency (rarely noted)

## How to apply

- Use your serum as part of your PM routine. Start using it 3 times a week and move to daily use if your skin likes it.
- Apply the serum after cleansing and toner, and right before your moisturizer.
- Gently press 2-3 drops of the serum into your skin and wait a minute ⏳for it to soak in.
- Apply the serum on clean and dry skin since your skin is not sensitive.
- Always do a patch test before using the serum for the first time, and avoid the eye area .
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

### How well does Medik8 C-Tetra work for combination skin?

Medik8 C-Tetra Serum offers moderate suitability for combination skin because tetrahexyldecyl ascorbate provides antioxidant protection and jojoba seed oil keeps skin soft, though these benefits do not directly target oily shine. A treatment for combination skin needs ingredients like niacinamide, propolis, and zinc PCA to regulate oiliness and provide balance without causing excess shine.

### Which ingredients make this serum a good fit for combination skin?

Tetrahexyldecyl ascorbate helps protect your skin with antioxidants, and jojoba seed oil keeps it soft. For this skin type, a treatment like this also needs ingredients like niacinamide, propolis, or zinc PCA to help control oily shine and balance hydration.

### What does Tetrahexyldecyl Ascorbate do for combination skin?

Tetrahexyldecyl Ascorbate helps brighten combination skin and protects it from daily damage while keeping areas soft and smooth. Because it is an oil-soluble form of vitamin C, it easily reaches deep into pores to fight dullness and signs of aging without feeling heavy on oily spots.
Sources: [International Journal of Molecular Sciences, 2021](https://pubmed.ncbi.nlm.nih.gov/34445461/)

### What does Jojoba Seed Oil do for combination skin?

Jojoba seed oil helps balance combination skin by calming redness and keeping the skin soft without feeling heavy. It is unlikely to clog pores and helps protect the skin barrier while adding light moisture.
Sources: [Frontiers in Pharmacology, 2024](https://pubmed.ncbi.nlm.nih.gov/38344180/), [International Journal of Molecular Sciences, 2017](https://pubmed.ncbi.nlm.nih.gov/29280987/)

### Where does this serum go in a skincare routine for combination skin?

This serum goes in your evening routine, applied after cleansing and before your moisturizer. Putting treatments in the evening keeps things simple and adds safety around sun exposure. Combination skin also needs ingredients that help balance oily shine.

### Can I use this serum with retinol, and in what order?

You can use this treatment alongside retinol by applying the retinol first at night, followed by this serum, or by using retinol on alternating nights. This approach helps you get antioxidant benefits while keeping your skin calm and comfortable.

### How often should I use this serum?

You can use this treatment in your evening routine for simplicity and extra safety around sun exposure. Combination skin needs products with oil-balancing or shine-controlling ingredients that specifically target oily shine.
Sources: [Facial Plastic Surgery, 2014](https://pubmed.ncbi.nlm.nih.gov/24488631/)

### Can this serum clog pores, cause breakouts or purging for combination skin?

This serum is unlikely to cause irritation or breakouts on your combination skin, though some shoppers do mention an oily or greasy feel. To work better for combination skin, a product of this type needs lightweight ingredients that help control oily shine while keeping the skin soft.
Sources: [Contemporary Clinical Trials Communications, 2021](https://pubmed.ncbi.nlm.nih.gov/34471722/)

### Is this serum fragrance-free and alcohol-free?

It has no drying alcohol and contains fragrance (limonene, citral, linalool, and geraniol).

## Alternatives for combination skin

- [Beauty of Joseon Propolis + Niacinamide Glow Serum](https://lovi.care/skincare/au/p/beauty-of-joseon/propolis-niacinamide-glow-serum/for/combination-skin) — Superior fit — A$16.95 at Amazon
- [Neogen Dermalogy Real Niacinamide 15% Firming Serum](https://lovi.care/skincare/au/p/neogen-dermalogy/real-niacinamide-15-firming-serum/for/combination-skin) — Superior fit — A$52.32 at Amazon
- [Augustinus Bader The Serum](https://lovi.care/skincare/au/p/augustinus-bader/the-serum/for/combination-skin) — Superior fit — A$639.95 at Amazon

## Pairs well with

- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/au/p/fresh/soy-face-cleanser/for/combination-skin) — Superior fit — A$73.61 at Amazon
- Hydrating Toner: [Paula's Choice Pore-Reducing Toner](https://lovi.care/skincare/au/p/paula-s-choice/skin-balancing-pore-reducing-toner/for/combination-skin) — Superior fit — A$42.00 at Amazon
- Moisturizer: [COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap](https://lovi.care/skincare/au/p/cosrx/oil-free-ultra-moisturizing-lotion-with-birch-sap/for/combination-skin) — Superior fit — A$22.99 at Amazon

## Where to buy

- Amazon.com.au: A$84.27 (https://www.amazon.com.au/dp/B094GHRY9B?tag=lovi-care-web-product-22&linkCode=osi&th=1&psc=1)
Prices checked 3 Nov 2026.

## Ingredients

Jojoba Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Grapefruit Peel Oil, Tocopheryl Acetate, Ppg-12 Smdi Copolymer, Limonene, Citral, Linalool, Geraniol
## About the Lovi Fit

Lovi: Unbiased, science-based skincare AI trained on real user outcomes.

Lovi calculates every fit score from the full ingredient list with brand-independent rules its dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update. Levels from best to worst: Superior, High, Average, Low, Caution, Warning.

Behind this fit score: Nadia Kapleva, MS (Co-founder, Medical Director); Alexey Shagraev, PhD (Co-founder, CEO and CTO); Dr. Sofía Perea Pérez, MD, MSc (Medical Board); Aishani Shah, MD (Medical Board); Asya Zubkova, MS (Medical Board); Hanna Kurets, MD (Medical Board, Medical Advisor); Elina Nazarenko, MD (Medical Board); Victoria Derkova, MS (Medical Board).

Page built Nov 8, 2026.

More from Lovi: https://lovi.care/skincare/llms.txt

## This page in other countries

- United States: https://lovi.care/skincare/p/medik8/c-tetra-serum/for/combination-skin
- United Kingdom: https://lovi.care/skincare/uk/p/medik8/c-tetra-serum/for/combination-skin
- Ireland: https://lovi.care/skincare/ie/p/medik8/c-tetra-serum/for/combination-skin
- Germany: https://lovi.care/skincare/de/p/medik8/c-tetra-serum/for/combination-skin
- France: https://lovi.care/skincare/fr/p/medik8/c-tetra-serum/for/combination-skin
- Italy: https://lovi.care/skincare/it/p/medik8/c-tetra-serum/for/combination-skin
- Netherlands: https://lovi.care/skincare/nl/p/medik8/c-tetra-serum/for/combination-skin
- Spain: https://lovi.care/skincare/es/p/medik8/c-tetra-serum/for/combination-skin
- Canada: https://lovi.care/skincare/ca/p/medik8/c-tetra-serum/for/combination-skin
- Australia: https://lovi.care/skincare/au/p/medik8/c-tetra-serum/for/combination-skin (this page)
- Singapore: https://lovi.care/skincare/sg/p/medik8/c-tetra-serum/for/combination-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/medik8/c-tetra-serum/for/combination-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/medik8/c-tetra-serum/for/combination-skin