NIOXIN Hair Fall Defense Leave-In Scalp Serum 2.3 fl oz — Niacinamide & Caffeine for Thicker, Stronger Hair

Nioxin Hair Fall Defense Intensive Daily Leave-In is a leave-on scalp serum formulated with niacinamide, caffeine, lauric acid, and SANDALORE™ to strengthen hair roots and reduce visible shedding with regular use.

This lightweight, daily leave-in treatment is designed for people experiencing thinning or fragile hair who want to improve hair anchorage and create the appearance of thicker strands. Developed by Nioxin Pro Clinical, the formula targets the scalp and follicle environment using a blend of active ingredients to support hair resistance and help hair look fuller from the first application, with measurable improvements in anchorage in clinical testing over time.

How quickly will I see results when I use this leave-in serum?

Users report visible thicker-looking hair after the first application, while clinical measurements showed average improvements in hair anchorage by eight weeks. Consistent daily application as directed is important to achieve and maintain results.

• Noticeable fullness from first use due to immediate strand coating
• Clinical anchorage improvement averaged at eight weeks in testing
• Daily use delivers cumulative benefits to scalp and follicle health

What are the key actives and what do they do for my scalp?

This formula combines niacinamide, caffeine, lauric acid and the fragrance-derivative SANDALORE™ to target multiple aspects of hair resilience. Each ingredient has a specific role: niacinamide supports the scalp’s barrier, caffeine stimulates the scalp microenvironment, lauric acid helps strengthen strands, and SANDALORE™ is included to support follicle response.

• Niacinamide: promotes a balanced scalp environment
• Caffeine: energizes the scalp microenvironment for better resistance
• Lauric acid: helps fortify individual hair fibers against breakage
• SANDALORE™: applied to engage follicle signaling for anchorage

How do I use the treatment for best results?

Apply the serum directly to a dry or towel-damp scalp once daily, focusing on areas where hair feels thinner. Massage gently to distribute the product to the roots, and leave it in—no rinsing required—so the actives can work throughout the day.

• Use daily as a leave-on treatment; do not rinse out
• Target the scalp at thinning zones and massage lightly for coverage
• Combine with a Nioxin system appropriate for your hair type for best outcomes

Is this safe for colored or chemically treated hair?

The formula is free of parabens, sulfates, and colorants, making it compatible with color-treated and chemically processed hair for most users. As with any new product, perform a patch test if you have a sensitive scalp or a history of reactions to topical treatments.

• Paraben-, sulfate-, and colorant-free
• Suitable for use on color-treated hair in most cases
• Patch test recommended for sensitive scalps

Who is this for: This Nioxin leave-in serum is aimed at adults noticing hair thinning, increased shedding, or weakened hair strands who want a daily, lightweight treatment to support stronger roots and a thicker appearance. It suits those seeking a non-rinse formula compatible with styling routines and with concerns about scalp health, whether hair is natural, dyed, or chemically processed.

Ingredients

Alcohol Denat., Aqua/Water/Eau, Niacinamide, Caffeine, Sandalore, Parfum/Fragrance, Lauric Acid, PEG-40 Hydrogenated Castor Oil, PEG-35 Castor Oil, Alpha-Isomethyl Ionone, Hexyl Cinnamal, Limonene, Alcohol, Linalool, Tocopherol, Citric Acid.