The NAHRS (North American Hair Research Society) Seal of Recognition Program was created to inform physicians and consumers about products whose quality and effectiveness are beneficial in some aspect in promoting healthy hair or scalp, in diagnosing or treating hair or scalp disease, in diagnosing or treating hair loss, or in stimulating or inhibiting hair growth.

TRI/Princeton has been certified by NAHRS to provide independent test result for the Seal of Recognition Program for claims including:

• Anti-frizz
• Build-up
• Color Fastness
• Curl Retention
• Diffusion of Product into the Hair Fiber
• Fiber Softness
• Flyaway Reduction (anti-static properties)
• Holding Ability (hold strength of hair fixatives)
• Manageability (product’s efficacy in increasing combing ease and decreasing tangles)
• Moisturizing Ability
• Protection from Heat Damage
• Shine
• Smoothness
• Strength
• Volume

Claims relating to other attributes may be supported on a case-by-case basis. Please contact us for more information

For more information on the NAHRS Seal of Recognition Program, please visit the NAHRS website.

Recent Publications

Certifying Hair Product Claims – Peter D. Kaplan, PhD, and Ram Ramaprasad, PhD discuss the NAHRS Seal of Recognition Program in the April 2010 issue of Cosmetics & Toiletries