C-15 Serum

$ 42.00 Regular price
Unit price

Prefer C | C-15 Serum is a thin, absorption-enhanced, 15% acid-C treatment that plays a pivotal role in collagen synthesis and in preventing the signs of aging.

Prefer C is freshly prepared per order to maximize shelf life while avoiding unpleasant and/or synthetic solvents and petrochemicals commonly used to replace water in ascorbic acid serums. Brand new serum begins as a champagne-colored liquid that darkens over time. For maximum potency, use within 2-3 months, or before serum begins to leave a visible (washable) tint upon application.


Apply a pump to entire clean face and neck at least once daily. For best result, wait 10-15 minutes before following with additional treatment and/or moisturizing products.

It is possible for particularly sensitive skin types to find acid C serums irritating, if this is you, you may want to opt for a different form of C. Because of C-15’s acidic nature, it should not be immediately followed by (or immediately applied over) products containing niacinamide to avoid experiencing symptoms associated with a localized niacin flush. These can include temporary tingling, itching, and redness at the application site for some people.


L-Ascorbic Acid:
An active form of antioxidant Vitamin C known for having age diminishing effects on skin, and synergistic uv damage preventative effects in combination with other antioxidants.

Ferulic Acid:
A uv-activated antioxidant having supportive and stabilizing effects on vitamin C, boosting the ability of vitamins C & E to protect skin from photo-aging.

Vitamin E:
This lipid soluble antioxidant nutrient is shown to enhance the sun-protective antioxidant effects of Vitamin C.

Hyaluronic Acid:
Hydrating glycosaminoglycan known for wound care, glycation inhibition and repair, and providing structure by binding water in the skin.

An antioxidant powerhouse, protective against uv induced skin damage, and skin brightener, found in grape skin.

Pro-vitamin B5 known for promoting moisturization and skin cell renewal.

Biosaccharide Gum:
This hydrating and skin-soothing sugar helps protect skin from irritation.

Dimethyl Isosorbide:
A sustainably produced, plant sugar sourced, non-toxic solvent and penetration-enhancer protects ascorbic acid from degradation, and feeds it more effectively into skin where it can produce maximum benefit.

Sodium Phytate:
All-natural plant-sourced chelator that helps to protect natural products without the use of potentially toxic disodium/tetrasodium EDTA and triethanolamine, and also offers other benefits to the skin such as improved elasticity, skin lightening, and texture refinement.

Also contains: Purified Water, and Ecocert-certified plant-sourced Probiotic Preservation.

C-15 Serum

C-15 Serum

$ 42.00