Pai-Shau Biphasic Infusion Hair Serum — 4 fl oz Oil-Free Leave-In for Shine, Smoothness & Heat Protection

Pai-Shau Biphasic Infusion Hair Serum is an oil-free, two-phase daily treatment that boosts shine, smoothness and environmental protection while keeping hair lightweight.

This biphasic formula blends a lightweight aqueous phase with a concentrated signature tea complex to strengthen and hydrate hair without adding grease. Designed to be shaken and applied as a leave-in, the serum seals in moisture, improves manageability and helps guard strands from heat styling and everyday environmental stressors. It’s packaged in a 4 fl oz bottle for regular use on all hair textures.

How does this serum make hair look shinier and smoother?

The formula works by smoothing the hair surface and enhancing light reflection for a visibly glossier finish. Hydrating actives in the signature tea complex help fill and seal the cuticle so hair appears sleeker and more uniform.

• Light-reflecting smoothing agents that reduce frizz.
• Hydration boosters that fill gaps in the cuticle.
• Non-greasy finish for natural, touchable shine.

Can I use it before heat styling for protection?

Yes—applied to damp or dry hair, the serum supports resistance to heat stress from styling tools. It creates a protective layer that helps minimize moisture loss during blow-drying or flat-ironing without weighing hair down.

• Effective as a pre-styling leave-in for heat exposure.
• Light, non-oily texture that won’t suffocate roots.
• Suitable for use under other styling products.

Will this work for my hair type and scalp needs?

The oil-free, lightweight profile makes it adaptable across hair types—from fine and straight to coarse and curly—especially when you want hydration without heaviness. Because it’s formulated to lock in moisture rather than coat hair in oil, it’s also a good choice for people with oilier scalps who still need protective conditioning.

• Safe for fine hair seeking volume and gloss.
• Good for textured or curly hair needing definition and frizz control.
• Non-greasy option for scalp-prone to oiliness.

How should I apply the serum for best results?

Shake the bottle to re-mix the biphasic layers, then dispense a small amount and distribute from mid-lengths to ends; add sparingly at the roots if needed. Use daily or before styling; adjust quantity based on hair density and desired finish.

• Shake well to activate the two phases.
• Start with a pea-sized amount and increase as needed.
• Apply to damp hair for detangling or dry hair for post-style smoothing.

Who is this for: Pai-Shau Biphasic Infusion Hair Serum is aimed at anyone wanting lightweight conditioning, added shine and protection without an oily finish. It’s appropriate for people who style with heat, live in urban environments and need everyday defense against humidity, pollution and mechanical wear, as well as those looking to improve manageability across all hair textures.

• OIL-FREE HAIR SERUM: Provides lightweight conditioning without leaving hair greasy.
• ENHANCES SHINE: Helps improve hair's natural shine and smooth appearance.
• THERMAL PROTECTION: Supports protection against heat styling damage.
• ENVIRONMENTAL DEFENSE: Helps shield hair from daily environmental stressors.
• FOR ALL HAIR TYPES: Suitable for all hair textures seeking hydration and manageability.

Ingredients

Cyclopentasiloxane, Cyclotetrasiloxane, Dimethicone, DimethiconeNinyl Dimethicone Crosspolymer, Water (Aqua), Glycerin,Thymus Serpyllum Extract , Monarda Didyma Leaf Extract, Camellia Sinensis Flower Extract, Camellia Sinensis Leaf Extract, Aspalathus Linearis Extract, Sea Salt (Maris Sal), Phenyl Dimethicone, Caprylyl Glycol, Linalool, Chlorphenesin, Phenoxyethanol, Fragrance (Parfum), Blue 1 (Cl 42090), Yellow 5 (Cl 19140), Red 33 (Cl 17200)