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Syoss Intense Plex Leave in Serum

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Syoss Intense Plex Leave in Serum

Serum Contains fragrance Contains colorants
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Expert note

Not recommended for Straight, Oily, Damaged hair. This serum contains several harsh or potentially harmful ingredients.

Syoss Intense Plex Leave in Serum by the brand — a serum formulated to balance and care for scalp and hair. Designed to leave hair feeling refreshed and lightweight.

Full Ingredient List

Isopropyl Alcohol, Methylisothiazolinone, Dimethicone, Laureth-4, Isopropyl Myristate, Phenoxyethanol, Fragrance, Methylparaben, Propylene Glycol, Benzyl Salicylate, Hexyl Cinnamal, Citric Acid, Tetramethyl Acetyloctahydronaphthalenes, Linalool, Linalyl Acetate, Vanillin, Tridecyl Trimellitate, Tridecyl Stearate, Trimethylsiloxyphenyl Dimethicone, Water, Eau, Cetrimonium Chloride, Hydroxyethylcellulose, Distearoylethyl Hydroxyethylmonium Methosulfate, Quaternium-91, Cetrimonium Methosulfate, Panthenol, Hydroxypropyltrimonium Betaine

Key Ingredients

Isopropyl Alcohol

Extremely drying

Methylisothiazolinone

Preservative known for causing allergic reactions and irritation

Dimethicone

Common silicone providing smoothness and shine, may build up

Laureth-4

Acts as a mild surfactant and emulsifier

Isopropyl Myristate

Emollient, can clog pores

Phenoxyethanol

Common preservative, generally safe in cosmetic amounts

Ingredient Breakdown

Ingredient Details Rating
Isopropyl Alcohol Extremely drying Bad
Methylisothiazolinone Preservative known for causing allergic reactions and irritation Bad
Dimethicone Common silicone providing smoothness and shine, may build up Moderate
Laureth-4 Acts as a mild surfactant and emulsifier Moderate
Isopropyl Myristate Emollient, can clog pores Moderate
Phenoxyethanol Common preservative, generally safe in cosmetic amounts Moderate
Fragrance Can cause allergies or irritation Moderate
Methylparaben Preservative, generally safe but some prefer paraben-free Moderate
Propylene Glycol Humectant, retains moisture Moderate
Benzyl Salicylate Fragrance ingredient with potential for irritation in sensitive scalps Moderate
Hexyl Cinnamal Jasmine-scented fragrance, may cause allergic reactions Moderate
Citric Acid pH adjuster, gentle exfoliant Moderate
Tetramethyl Acetyloctahydronaphthalenes Synthetic fragrance compound for long-lasting scent Moderate
Linalool Fragrance component, potential allergen Moderate
Linalyl Acetate Fragrance component that can cause sensitivity in some individuals Moderate
Vanillin Fragrance ingredient with minimal impact on hair health Moderate
Tridecyl Trimellitate Emollient that adds softness and shine without greasiness Moderate
Tridecyl Stearate Emollient providing smoothness and reducing frizz Moderate
Trimethylsiloxyphenyl Dimethicone Silicone that enhances shine and smoothness but may cause buildup Moderate
Water Base solvent, neutral Good
Eau Hydrates and acts as a solvent for other ingredients Good
Cetrimonium Chloride Antistatic, conditioning agent Good
Hydroxyethylcellulose Thickening agent that enhances texture and moisture retention Good
Distearoylethyl Hydroxyethylmonium Methosulfate Conditioning agent that reduces static and improves manageability Good
Quaternium-91 Conditioning agent that softens and detangles hair Good
Cetrimonium Methosulfate Mild conditioning agent that reduces static and detangles hair Good
Panthenol Pro-Vitamin B5, adds shine and moisture Good
Hydroxypropyltrimonium Betaine Conditioning agent that reduces static and enhances hair manageability Good

Safety & Allergens

Fragrance allergens (linalool, geraniol, coumarin) may be present if fragrance is listed.

Colorants are aesthetic only — skip if you react to synthetic dyes.

Strong surfactants and fragrance can bother very sensitive scalps.

Patch test before full use if you have fragrance allergies or reactive skin.

Summary

Best suited for users seeking a clear, balanced cleanse. Effectively targets buildup while maintaining a light feel. Be mindful of surfactant strength and fragrance if you are sensitive.

Refreshing cleanse with balanced oil control Light fragrance in formula Sensitive scalps: monitor
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