goop Beauty Sleep Milk Serum — 10% Multi‑Acid Glycolic + Hyaluronic Overnight Exfoliator, 1 fl oz

goop Beauty Sleep Milk Serum is an overnight 10% multi‑acid milk serum that exfoliates, resurfaces, and hydrates to smooth texture, refine pores, and brighten skin over time.

This silky, lightweight milk serum blends glycolic and lactic acids with hydrating humectants to deliver chemical exfoliation while you sleep. Designed for evening use, it resurfaces flaky or rough patches, targets dark spots and dullness, and leaves skin feeling softer and looking more luminous with repeated use. It can be used across the face, neck, and chest and also doubles as a quick mask or a targeted spot treatment.

How quickly will I see smoother, more radiant skin?

Some users notice immediate softening after the first application because the formula combines acids with moisturizing ingredients to avoid over‑drying. Visible improvements in texture and radiance typically appear within two weeks of consistent evening use as cell turnover increases and surface dullness fades.

• Immediate: softer, hydrated skin after first use for most people
• 2 weeks: improved texture and increased radiance for many users
• Ongoing: continued use helps reduce clogged pores and uneven tone

What are the active ingredients and how do they work together?

The serum combines glycolic acid and lactic acid at a 10% total acid concentration to chemically exfoliate the top layer of skin, plus hyaluronic‑type humectants to restore moisture. Glycolic acid speeds surface renewal while lactic acid offers gentler exfoliation and humectant benefits, creating a balanced resurfacing effect without excessive tightness when used as directed.

• Glycolic acid: accelerates exfoliation to refine texture
• Lactic acid: milder AHA that helps hydrate while exfoliating
• Humectants (e.g., hyaluronic types): pull in moisture to preserve softness

How should I incorporate this serum into my evening routine?

Apply one to three pumps to clean, dry skin on the face, neck, and décolletage in the evening. Start with two to four nights per week and increase frequency as your tolerance improves; many people progress to nightly use. If you feel tingling, layer a moisturizer over the serum or use it as a five‑minute mask for a shorter exposure time.

• Begin: 2–4 nights weekly to build tolerance
• Targeting: use as a spot treatment on areas with dark spots or rough patches
• Mask option: apply and leave for five minutes, then rinse for a quick boost

Is this serum suitable for sensitive or acne‑prone skin?

The multi‑acid formula can be potent for sensitive complexions, so patch testing is recommended. Those with acne‑prone skin often find chemical exfoliation helpful for unclogging pores, but start slowly and combine with gentle, non‑irritating cleansers and moisturizers. Always use sunscreen daily while using acid exfoliants to protect renewed skin.

• Patch test first on inner forearm or behind ear
• Introduce gradually to avoid irritation
• Pair with daily SPF to protect fresh skin cells

Who is this for: goop Beauty Sleep Milk Serum suits anyone looking to refine skin texture, smooth fine lines, reduce the appearance of dark spots, or minimize clogged pores without a heavy, oily feel. It’s ideal for people comfortable using chemical exfoliants and those seeking overnight resurfacing that also hydrates. If you have highly reactive skin, consult a dermatologist and introduce the product slowly.

Ingredients

Aqua/Water/Eau, Caprylic/Capric Triglyceride, Glycolic Acid, Squalane, Sodium Hydroxide, Behenyl Alcohol, Gluconolactone, Lactic Acid, Glycerin, Polyglyceryl-10 Dioleate, Pentylene Glycol, Propanediol, Magnesium Aluminum Silicate, Sodium Hyaluronate, Aloe Barbadensis Leaf Juice, Salicornia Herbacea Extract, Hydrogenated Lecithin, Hibiscus Sabdariffa Flower Extract, Piperonyl Glucoside, Polyglutamic Acid, Avena Sativa (Oat) Bran Extract, Tamarindus Indica Seed Polysaccharide, Simmondsia Chinensis (Jojoba) Seed Oil, Adansonia Digitata Seed Oil, Citrullus Lanatus (Watermelon) Seed Oil, Phospholipids, Adansonia Digitata Fruit Extract, Cyclodextrin, Xanthan Gum, Glyceryl Undecylenate, Glyceryl Caprylate, Tetrasodium Glutamate Diacetate, Caprylyl Glycol, Ethylhexylglycerin, Sclerotium Gum, 1,2-hexanediol, Polyglyceryl-10 Dipalmitate, Sodium Benzoate, Potassium Sorbate, Citric Acid.