Theorem - Product Catalog - The Theorem Method
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Our Products.

The Theorem Method is a 3-part haircare system that offers a simple solution to healthier hair.
Our simple 3-part system offers lightweight, nourishing solutions that support healthy hair growth while mending
damaged, brittle hair. Resulting in thicker, longer, stronger, and healthier hair.

The Method

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The Curly Method

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The Blowout Method

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Square Root

Volumizing Root Serum.

For Fine, Thinning Hair.

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Density

Deep Conditioning Repair Mask.

For chemically treated, colored or heat damaged hair.

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Sugar Pi

Damage Recovery Oil.

For dry, frizzy hair and split ends.

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Spectra

Blonde Boosting Shampoo

For blonde, highlighted or gray hair

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Spectra

Blonde Boosting Conditioner

For blonde, highlighted or gray hair

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Spectra Duo

Blonde Boosting Duo

For blonde, highlighted or gray hair

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Infinity

Hydration Shampoo

For dry, damaged or frizzy hair

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Infinity

Hydration Conditioner

For dry, damaged or frizzy hair

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Infinity Duo

Hydration Shampoo & Conditioner

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Volume

Texturizing Shampoo

For fine, thin or flat hair