Healing Strength Neem Plant Silk Serum is a leave-in silicone-based serum from L'ANZA formulated to protect hair from heat styling and reduce breakage. "Plant Silk" in the name is L'ANZA's marketing language for the serum's smoothing effect — it isn't a specific listed ingredient, so don't expect to find "plant silk" itself on the ingredient panel.

The real actives here are neem extract, keratin amino acids, ceramide NP and sodium hyaluronate, layered into a silicone base (cyclopentasiloxane, dimethicone) with a UV filter for added heat and sun protection during styling. L'ANZA's claim of "7.5x less breakage" applies to using its full Healing Strength system together, not this serum used on its own.

Best suited to damaged or breakage-prone hair looking for a lightweight leave-in that adds shine and eases blow-drying, rather than a deep-conditioning treatment. It's free of sulfates, parabens, phthalates and gluten, per L'ANZA.

Apply to damp hair before blow-drying to help cut down drying time, or smooth a small amount onto dry hair for added shine and control.

Cyclopentasiloxane, Dimethicone, Caprylyl Methicone, Diphenylsiloxy Phenyl Trimethicone, Perfluorononyl Dimethicone, Melia Azadirachta (Neem) Extract, Keratin Amino Acids, Santalum Album (Sandalwood) Extract, Phellodendron Amurense Bark Extract, Hordeum Distichon Extract, Dimethiconol Cysteine, Ceramide NP, Sodium Hyaluronate, Dimethicone PEG-8 Meadowfoamate, Sodium PCA, Zinc PCA, Magnesium PCA, Manganese PCA, Citrus Limon Fruit Extract, Fumaria Officinalis Flower/Leaf/Stem Extract, Helianthus Annuus (Sunflower) Seed Oil, Squalane, Fumaric Acid, Ethylhexyl Methoxycinnamate, Tetrahexyldecyl Ascorbate, Trimethylsiloxyamodimethicone, Ascorbyl Methylsilanol Pectinate, Butylene Glycol, Water, Benzotriazolyl Dodecyl p-Cresol, Fragrance.