Kosi Multi-Acid Mask

Regular price $58
Regular price Sale price $58
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Go beyond superficial.

For: All skin types, especially in times of visible fatigue or dullness (it happens, you do a lot).


All good skincare routines could use a coach or point-person to keep your progress in check. Consider this mask your periodic skincare project manager or concierge, helping make quick work of issues like dullness, splotchiness, and any visible signs that you’re not drinking 64 ounces of water daily (who has the time?). Kosi goes beyond superficial layers, reaching down to the cellular level to help prevent future skin damage as well — this is not just another exfoliating resurfacer. With a multi-functional acid blend, protective antioxidants, and the power of algae and seaweed, this formula helps recharge skin back to its most vibrant, refreshed, and energized self.


Helps to brighten skin overall, and diminish the look of hyperpigmentation and dullness, while restoring vibrancy to skin tone.

Penetrates below skin’s surface to help repair damage on a cellular level, which can aid in preventing the appearance of future damage and premature aging.

The multi-functional ingredient profile can help to exfoliate, hydrate, restore, and protect against inflammation (kind of like AAA for your skincare journey).

How to use

On a cleansed face, apply an even layer. After 10-20 minutes, rinse thoroughly with warm water and follow with Grand Amino Cushion Cream for best results. Use up to twice a week before bedtime. Do not use other exfoliating products in the same routine. Slight tingling and/or mild redness upon application may be experienced and is normal. Always wear sunscreen the morning after (but also every day in general).

WARNING: For external use only. Use as directed. Avoid contact with eyes.

SUNBURN ALERT: This product contains an alpha hydroxy acid (AHA) that may increase your skin’s sensitivity to the sun and particularly the possibility of sunburn. Discontinue use immediately if irritation occurs & consult a physician. Use sunscreen daily where AHA has been applied for a week afterwards. Product's contact with skin must be of limited frequency or duration.

Pore Confession: If beauty is skin deep, why not meet it where it is?

Full Ingredients

  • Water (Aqua) (Eau)
  • Gluconolactone
  • Prunus Persica (Peach) Kernel Oil
  • Lactic Acid, Glycerin
  • Isoamyl Laurate
  • Simmondsia Chinensis (Jojoba) Seed Oil
  • Bentonite, Malic Acid
  • Cetearyl Olivate
  • Salicylic Acid
  • Sorbitan Olivate
  • Undaria Pinnatifida Cell Culture Extract
  • Mandelic Acid
  • Chlamydomonas Reinhardtii Extract
  • Helianthus Annuus (Sunflower) Seed Oil
  • Disodium Acetyl Glucosamine Phosphate
  • Magnesium Chloride
  • Melia Azadirachta Flower Extract
  • Curcuma Longa (Turmeric) Root Extract
  • Ginkgo Biloba Leaf Extract
  • Avena Sativa (Oat) Kernel Extract
  • Isoamyl Cocoate
  • Lysolecithin
  • Silica
  • Sclerotium Gum
  • Potassium Sorbate
  • Xanthan Gum
  • Pullulan
  • Leuconostoc/Radish Root Ferment Filtrate
  • Sodium Hydroxide

Rethinking Skincare As Skin Situations

Skin types describe a baseline of skin’s behavior. But sometimes skin decides to misbehave, and that’s when we have a situation. Situational Skincare is taking a solution-oriented approach to skincare based on what it needs day-to-day.


Percentages Matter

Skin Strategy

Key Ingredients

And their benefits

10% AHA Blend

Lactic, Mandelic, Malic Acids are chemical exfoliators of various molecule sizes. They help gently break down debris and dead skin cells loitering on the skin's surface.

8% PHA (Gluconolactone)

An overachieving acid exfoliator that not only does what AHAs can do, but it’s gentler because it simultaneously helps hydrate skin with humectant properties.

2% BHA (Salicylic Acid)

A larger-molecule exfoliator, this acid is oil-soluble, so it can actually penetrate pores to more deeply clear them of debris and gunk, helping to shrink blackheads and whiteheads.

Diglucosyl Gallic Acid

This molecule is activated by your skin’s microbiome, partially transforming it into Tri Hydroxy Benzoic Acid, a natural melanin synthesis inhibitor. It has skin-brightening, anti-inflammatory, and photo protectant properties, which help to even-out and improve overall skin tone.

Peach Kernel Oil, Jojoba Seed Oil, Glycerin, Caprylic/Capric Triglyceride

These cushioning ingredients form a gel-oil base, a protective and nourishing buffer for the aforementioned acids to do their job without causing excess irritation. Think of them like gutter bumpers on a bowling lane.Lactic, Mandelic, Malic Acids are chemical exfoliators of various molecule sizes. They help gently break down debris and dead skin cells loitering on the skin's surface.

Wakame Bioferment Advanced (Undaria Pinnatifida Cell Culture Extract)

This unique seaweed-derived active is found in cultured wakame cells. It can contribute to cell longevity by minimizing cellular damage within the mitochondria, which can help minimize the appearance of premature aging.

AcquaSeal Algae (Chlamydomonas reinhardtii extract)

Derived from a particularly robust green algae that can thrive in extreme environments, this oil-soluble active produces a bioactive complex of lipids and fatty acids that helps renew and hydrate cells to promote cell proliferation and can have anti-inflammatory benefits.

N-Acetyl Glucosamine

A stable and effective form of biofermented glucosamine, this skin-identical ingredient helps reduce the appearance of hyperpigmentation, increase the skin’s water content with hyaluronic acid, and maintain its barrier functions.


This mineral helps soothe inflammation in skin, helps protect against free radical damage, and is necessary for the enzymes that help to regulate cell turnover and rejuvenation.

Antioxidant Blend

Turmeric Root Extract: a highly-soothing antioxidant that can interrupt trigger signals in surface cells that lead to irritation. Ginkgo Biloba Extract: a potent antioxidant that helps protect skin from signs of premature aging and inflammation. Oat Kernel Extract: This super-soothing antioxidant is loaded with beta-glucan and lipids to help protect and cushion skin. Melia Azadirachta (neem) Leaf Extract: This antioxidant has anti-microbial properties that help diminish the population of harmful microbes on the skin's surface, which can reduce inflammation and calm the skin.

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