InLei® Molecular 4 is an advanced no-rinse reconstructive gel designed for eyelashes and eyebrows. Created to enhance and complete the Lash Filler® 25.9 system, this final step works at a molecular level to rebalance, strengthen and refine the hair structure.

Formulated with a precise blend of vegetable-based proteins and next-generation hydration technology, Molecular 4 improves every visible aspect of the hair fibre — from shine and softness to elasticity, strength and colour retention.

How Molecular 4 Works

This innovative formula combines proteins of different molecular weights to deliver both surface protection and deep reconstruction:

• High molecular weight components form a lightweight protective film around the hair shaft, smoothing the cuticle and reinforcing strength

• Low molecular weight components penetrate the cortex, restoring moisture, elasticity and internal balance

An advanced form of hyaluronic acid binds directly to the hair, delivering long-lasting hydration and leaving lashes and brows exceptionally soft and silky.

Key Active Ingredients & Benefits

Hydroxypropyltrimonium Hyaluronate
A next-generation hyaluronic acid engineered to adhere to lashes and brows.

• Attracts and retains high levels of moisture

• Enhances softness, smoothness and shine

• Improves overall hair flexibility and hydration

Quinoa Protein
A complete vegetable protein containing all 8 essential amino acids.

• Strengthens hair structure and firmness

• Enhances colour absorption and longevity

• Boosts shine for a healthy, luminous finish

Hydrolysed Wheat Proteins

• Penetrate the hair cortex to improve hydration

• Increase elasticity and softness

• Form a protective barrier against heat and environmental stress

Hydrolysed Vegetable Protein Complex
A technologically advanced ingredient developed to counteract both physical and chemical damage.

• Low molecular weight proteins strengthen hair internally

• High molecular weight proteins protect and lubricate the surface

• Improves resistance to breakage from tools, friction and aggressive treatments

Why Professionals Choose Molecular 4

• Molecular-level reconstruction for lashes and brows

• Enhances results of Lash Filler® 25.9 treatments

• Improves shine, strength, elasticity and colour retention

• Lightweight, no-rinse gel texture

• Designed exclusively for professional use

For professional use only
Refer to official application instructions for correct protocol.