Function of Strength Shampoo


★★★★★4.9 (6,407 reviews)


Your Personal Strengthening Shampoo

Increase your hair's resilience and elasticity, stimulate healthy hair growth and protect your hair from breakage.

Tell us what you want and need for your hair, and we'll individually formulate and fill a product that is as unique as you!


Sulfate free, paraben free, no toxins

Active Ingredients: horsetail extract + evening primrose oil


Rinse hair thoroughly with warm water, allowing the cuticles in your hair to open up. Apply a quarter sized amount of shampoo and lather into hair, using your palms and fingers to massage into scalp. Avoid tight, circular motions in order to prevent damage and hair breakage. Finally, rinse hair with warm water until it is free of shampoo.


After rinsing off the shampoo, apply a quarter sized dollop of conditioner and apply from the middle to the ends of your hair strands, avoiding the hair roots. Leave conditioner for 2 minutes before rinsing off with warm water.
Function of Beauty was founded by a team of world-class MIT engineers and data scientists who spent years building an algorithm and machines that pull from hundreds of ingredients to potentially create billions of completely unique shampoo and conditioner combinations.