10% Tetrahexyldecyl Ascorbate / BV-OSC® Vitamin C
The hero active in the formula.
Tetrahexyldecyl Ascorbate is a stable, lipid-soluble Vitamin C derivative used to provide antioxidant protection, support brighter-looking skin and contribute to collagen-related processes.
Because it is lipid soluble, it behaves differently from pure L-Ascorbic Acid and does not require the same highly acidic water-based environment.
The manufacturer's current 10% Vitamin C claim refers to this Tetrahexyldecyl Ascorbate technology.
Vitamin F Forte
Vitamin F is not a vitamin in the conventional nutritional sense. In skincare, the term refers to essential fatty acids, principally:
Linoleic Acid — Omega-6
Supports the skin's lipid barrier and helps maintain moisture retention.
Linolenic Acid — Omega-3
Provides complementary lipid, soothing and conditioning support.
NassifMD specifically uses the Vitamin F complex to complement Vitamin C with hydration, barrier and antioxidant benefits.
Meadowfoam Seed Oil
Limnanthes Alba Seed Oil is rich in long-chain fatty acids and helps soften the skin while reducing moisture loss.
It contributes to the serum's nourishing feel without functioning as a heavy occlusive cream.
PhytoSqualane® / Squalane
A lightweight emollient with excellent compatibility with the skin's natural surface lipids.
Squalane helps support suppleness, soften dry skin and limit transepidermal moisture loss.
NassifMD currently describes its PhytoSqualane® technology as olive-derived.
Floramac® / Ethyl Macadamiate
A Macadamia-derived emollient rich in lipid components related to palmitoleic acid.
It helps improve softness and supports the moisture barrier while contributing to the serum's silky finish.
Vitamin E / Tocopherol
Provides complementary lipid-soluble antioxidant protection and helps condition the skin.
Bisabolol
A soothing ingredient that helps support skin comfort and complements the antioxidant formula.
Malic Acid
An organic acid present at a much lower position in the ingredient list.
It provides complementary skin-conditioning and tone-supporting activity, but this product should not be positioned primarily as an exfoliating acid serum.

Full Ingredient List:
Caprylic/Capric Triglyceride, Dicaprylyl Ether, Limnanthes Alba (Meadowfoam) Seed Oil, Tetrahexyldecyl Ascorbate, Squalane, Ethyl Macadamiate, Linoleic Acid, Linolenic Acid, Palmitic Acid, Stearic Acid, Oleic Acid, Malic Acid, Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Nobilis (Mandarin Orange) Peel Oil, Citrus Grandis (Grapefruit) Peel Oil, Tocopherol, Glycine Soja (Soybean) Oil, Bisabolol, Limonene.

Use morning and evening.
After cleansing and toning, apply a few drops evenly over the face and neck.
Allow the serum to absorb for at least one minute before applying additional skincare or makeup.
It may also be:
Applied directly to areas of concentrated pigmentation as a spot treatment
Mixed with 2–3 drops into your moisturiser as a brightening booster
Follow with moisturiser if required.
Every morning, finish with broad-spectrum sunscreen.

Uneven-looking skin tone
Sun-related pigmentation
Post-acne dark marks
Dull or lacklustre skin
Visible signs of previous sun exposure
Fine lines and wrinkles
Rough or uneven-looking texture
Loss of radiance
Dry or moisture-depleted skin
Reduced skin suppleness
Environmentally stressed skin
Early and established photoageing
Clients wanting antioxidant and lipid support in one serum

The virtually clear serum has a watery feel that spreads easily and absorbs quickly, leaving skin feeling soft and smooth, with no tackiness. Allow serum to absorb completely before applying other skincare or makeup.