# Dermalogica BioLumin-C vs Sunday Riley C.E.O.

**Question answered:** Should I choose Dermalogica BioLumin-C Vitamin C Serum or Sunday Riley C.E.O. 15% Vitamin C Brightening Serum?

**Short answer:** Choose Sunday Riley C.E.O. 15% Vitamin C Brightening Serum if you want a stated 15% vitamin C in an oil-soluble form, with squalane, for morning or night. Choose Dermalogica BioLumin-C Vitamin C Serum if you want a lighter, water-based serum that combines two vitamin C derivatives with lactic acid and a peptide; Dermalogica lists it for all skin types. Both list citrus oils, so neither suits fragrance avoidance.

By Nora Ellison. Published 2026-10-28. Data is taken from manufacturer labels; the products have not been tested.

## What this means for you

### Start with what you notice

Both are prestige vitamin C serums for dullness and uneven tone. The choice is about the form of vitamin C, the texture, and what else is in the bottle.

### The ingredient names, translated

Vitamin C comes in several forms. C.E.O. uses tetrahexyldecyl ascorbate, an oil-soluble form, at a stated 15%. BioLumin-C uses ascorbyl methylsilanol pectinate and aminopropyl ascorbyl phosphate without a stated percentage, plus lactic acid, an AHA, and palmitoyl tripeptide-5. Different forms and undisclosed amounts make a strength comparison impossible.

### How to decide

- Want a stated percentage and a richer, squalane-based feel? Sunday Riley C.E.O.
- Want a lighter serum with a peptide and lactic acid? Dermalogica BioLumin-C.
- Sensitive to acids or citrus oils? Check both labels; each lists some.

### What to expect

Vitamin C works gradually and alongside daily sunscreen. Neither replaces SPF or treats melasma on its own. We haven't tested either product.

General guidance, not a test of these products: [Topical vitamin C: benefits and formulation limits](https://pmc.ncbi.nlm.nih.gov/articles/PMC3673383/); [AAD: how to fade dark spots](https://www.aad.org/public/everyday-care/skin-care-secrets/routine/fade-dark-spots). Each product's label source is linked on its product page.

## Form of vitamin C and texture

[Dermalogica BioLumin-C Vitamin C Serum](product:dermalogica-biolumin-c-vitamin-c-serum) leads with water, glycerin, butylene glycol and ethoxydiglycol, then [lactic acid](/ingredients/lactic-acid/), chia seed oil, sodium PCA and palmitoyl tripeptide-5. Its vitamin C comes from two derivatives, with no percentage stated. Dermalogica lists it for all skin types.

[Sunday Riley C.E.O. 15% Vitamin C Brightening Serum](product:sunday-riley-c-e-o-15-vitamin-c-brightening-serum) lists tetrahexyldecyl ascorbate second, at a stated 15%, then [squalane](/ingredients/squalane/), beeswax derivatives, soybean sterols and tocopherol. It's a 30 mL serum for morning and/or night.

> **Skin Realist check:** comparing vitamin C percentages across different forms is like comparing miles to kilometers without the conversion. The label just doesn't give you one.

## Label differences worth knowing

Both list an AHA and citrus oils. BioLumin-C comes in several sizes; C.E.O. is listed at 30 mL. For more [vitamin C](/ingredients/vitamin-c/) options, see our [vitamin C serum guide](/articles/best-vitamin-c-serum/) and our [CeraVe vs COSRX vitamin C comparison](/comparisons/cerave-vs-cosrx-vitamin-c-serum/).

## Manufacturer sources

- [Dermalogica BioLumin-C Serum](https://www.dermalogica.com/products/biolumin-c-serum)
- [Sunday Riley C.E.O. 15% Vitamin C Brightening Serum](https://sundayriley.com/products/ceo-vitamin-c-brightening-serum)

Sources and label-check dates are recorded on the product pages.

| Product | Key ingredients | Skin types | Fragrance | Flagged ingredients | Size | Source | Buy |
| --- | --- | --- | --- | --- | --- | --- | --- |
| [Dermalogica Biolumin-C Vitamin C Serum](https://dermalguide.com/products/dermalogica-biolumin-c-vitamin-c-serum/) | Vitamin C | oily, dry, combination, sensitive, normal | Scent ingredients flagged | Citrus Grandis (Grapefruit) Peel Oil, Limonene | Brand doesn't list it | [Manufacturer label](https://www.dermalogica.com/products/biolumin-c-serum), checked 2026-10-11 | [Amazon (affiliate)](https://amzn.to/4jRaYaA) |
| [Sunday Riley C.E.O. 15% Vitamin C Brightening Serum](https://dermalguide.com/products/sunday-riley-c-e-o-15-vitamin-c-brightening-serum/) | Vitamin C (THD Ascorbate) 15% | Brand doesn't say | Scent ingredients flagged | Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Tangerina (Tangerine) Peel Oil, Linalool, Limonene | 30 ml | [Manufacturer label](https://sundayriley.com/products/ceo-vitamin-c-brightening-serum), checked 2026-10-10 | [Amazon (affiliate)](https://amzn.to/4e0IU0M) |

## Which to choose

Consider Dermalogica Biolumin-C Vitamin C Serum when: You want a lighter, water-based serum with a peptide and lactic acid; You want a serum the brand lists for all skin types.

Consider Sunday Riley C.E.O. 15% Vitamin C Brightening Serum when: You want a stated 15% vitamin C in an oil-soluble form; You like a richer feel with squalane and plant sterols.


## Questions

### Which form of vitamin C does each use?

C.E.O. uses tetrahexyldecyl ascorbate (THD ascorbate). BioLumin-C lists ascorbyl methylsilanol pectinate and aminopropyl ascorbyl phosphate.

### Do they contain acids?

BioLumin-C lists lactic acid fifth. C.E.O. lists glycolic acid in the middle of its list.

### Which lists citrus oils?

BioLumin-C lists grapefruit peel oil and limonene. C.E.O. lists orange and tangerine peel oils, linalool and limonene.