Shake well to activate the two layers.

In the morning, after cleansing and toning, apply 6 to 8 drops onto clean face and neck.

Follow with moisturizer and sunscreen - pairing vitamin C with sunscreen can improve the efficacy of SPF, charging the skin's defense against photoaging and sun damage.

Appearance - Bilayer liquid serum

Color - Orange top layer, yellow bottom layer (no artificial colors)

Scent - Fragrance free

pH - 3 to 4

Viscosity - Varies by layer

Water / Aqua, Ascorbic Acid, Butylene Glycol, Propanediol, Squalane, Alcohol, Rosa Canina Fruit Oil, Bis-Peg-18 Methyl Ether Dimethyl Silane, Glycerin, Panthenol, Caffeine, Levan, Xanthophylls, Gardenia Florida Fruit Extract, Morinda Citrifolia Extract, Portulaca Oleracea Extract, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Capsicum Annuum Fruit Extract, Bisabolol, Helianthus Annuus (Sunflower) Seed Oil, Olea Europaea (Olive) Fruit Oil, Arginine, Carnitine, Glycine, Hibiscus Sabdariffa Flower Extract, Hippophae Rhamnoides Fruit Extract, Tocopherol, Carthamus Tinctorius Seed Oil, Tetrasodium Edta, Aronia Arbutifolia Fruit Extract, Glycyrrhiza Uralensis (Licorice) Extract, Calendula Officinalis Extract, Euterpe Oleracea Fruit Extract, Taraxacum Coreanum Flower Extract, Ferulic Acid, Allantoin, Sodium Metabisulfite, Boerhavia Diffusa Root Extract, Adenosine, Viscum Album (Mistletoe) Extract, Phaseolus Radiatus Seed Extract, Caprylyl/Capryl Glucoside, 1,2-Hexanediol, Sodium Hyaluronate, Carthamus Tinctorius (Safflower) Seed Oil, Pinus Pinaster Bark Extract, Tremella Fuciformis Extract, Ubiquinone, Glutathione, Polysorbate 60, Sodium Carbonate, Hydroxycinnamic Acid, Vaccinium Myrtillus Fruit Extract, Aloe Barbadensis Extract, Beta-Glucan, Ethylhexylglycerin

Artificial fragrances

Artificial colors

Parabens

Sulfates (including SLS + SLES)

Siloxanes

Phthalates

BHA + BHT

Triclosan + triclocarban

DEA-related ingredients

Formaldehyde releasing ingredients

Clinically tested

Our products are developed using multiple rounds of clinical testing, including instrumentation studies and in-house consumer perception trials, which are:

• Representative, balanced across ages, skin types, skin concerns and level of concern
• Statistically significant, with carefully designed sample sizes to maximize validity of the outcomes
• Randomized, blind & competitor controlled, to mitigate any bias

Dermatologist tested

Our products are tested under the supervision of a dermatologist, using RIPT - a form of safety testing where a dermatologist observes, records, and evaluates the product’s safety in use, confirming it has low irritation potential or allergenicity.

Batch testing

We do extensive no-skip-lot testing (including key ingredient assay and microbiological analysis) at each step of the manufacturing process as well as on the final product, ensuring rigorous quality assurance and quality control standards to guarantee consistency across production batches.

Shake well to activate the two layers.

In the morning, after cleansing and toning, apply 6 to 8 drops onto clean face and neck.

Follow with moisturizer and sunscreen - pairing vitamin C with sunscreen can improve the efficacy of SPF, charging the skin's defense against photoaging and sun damage.

Our patented stabilizing technology provides advanced protection against photoxidative breakdown, preserving the efficacy of 15% L-ascorbic (pure vitamin C) over the usage period. It is recommended that the bottle be used within 3-6 months after opening.

Note that the 1 ounce (30ml) bottle is designed to be a 2-3 month supply, with consistent, daily use.

Yes, most people with sensitive skin can use this serum safely. This serum is formulated with a pH greater than 3 to avoid disrupting the skin’s natural pH while optimizing for active absorption. It has also been tested on sensitive skin under dermatologist supervision as part of clinical RIPT to ensure compatibility with all skin types. However, given the high concentration of the active ingredient, we recommend patch testing before starting use and reducing the frequency of use in case of irritation.

Pure vitamin C has a natural scent that is slightly sour - Since XC15 is formulated with 15% stabilized pure vitamin C and does not have any added artificial fragrances (to avoid common allergens), you are likely to smell its natural scent within the formula but consider it as a certificate of authenticity that disappears quickly as the product is absorbed.

Everyone’s skin is different but based on clinical testing, it is normal to notice benefits (skin radiance/hydration) in as little as 2 weeks. Other longer term benefits like improvement in hyperpigmentation/discoloration and fine lines/wrinkles may take longer. As long as you continue your daily use, the pure vitamin C is doing its job combatting all 8 signs of aging, preventing against photooxidative and environmental damage.

Yes, we strongly recommend pairing your vitamin C serum with a broad spectrum sunscreen. While this serum does not replace SPF, pairing vitamin C with sunscreen can improve the efficacy of SPF, charging the skin's defense against photoaging and sun damage.

Yes, we recommend using this vitamin C serum as the first step as part of your morning regimen, while a retinol or retinoid should be used as part of your nighttime regimen. There is no conflict in using both within the same daily skincare regimen, as long as you keep your skin hydrated and ensure skin tolerability. However, if you’re unsure about introducing new products into your routine, it is always best to consult a dermatologist.

Our patented stabilizing technology provides advanced protection against photoxidative breakdown, preserving the efficacy of 15% L-ascorbic (pure vitamin C) over the usage period. However, if stored at high temperatures for prolonged periods, you might notice a slight darkening in color, typical of pure vitamin C due to exposure to air and light. This darkening doesn't mean it's spoiled - the serum is still very effective but it does indicate a relative decrease in potency. 

We recommend using your bottle within 6 months of opening and storing in a cool, dry place once opened -  Note that the 1 ounce (30ml) bottle is designed to be a 2-3 month supply, with consistent, daily use.

Yes, all forms of topical vitamin C (including L-ascorbic acid) are generally considered safe during pregnancy or while breastfeeding. However, if you’re uncertain about using any new skin care product or ingredient, please consult your physician.