Your Theorem Representative is:ThedaBlackwood
Specialist ID 100423
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It's All On Your Head.

What if beautiful hair could be defined
by a simple math problem?

Get stronger, thicker hair at an exponential rate.

Square Root
Square Root
Square Root

Square Root

Multiply your hair

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Density
Sugar Pi
Square Root

Density

Add Volume

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Sugar Pi
Sugar Pi
Square Root

Sugar Pi

Subtract split end

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Theorem Method

The Theorem Method

Driven by beauty, backed by science

Our team is composed of brilliant scientists and designers with 75 years of combined experience. We have developed best-selling products with over a billion dollars in revenue sold worldwide. Disappointed with products on the shelf, we designed unique formulas with proven results to give YOU, your very best hair!

Who is Theorem?

We are a direct selling company that specializes in producing and developing our own line of high-end hair products. Our products are manufactured by us in our Chicago based lab.

Hair chemistry at its best.

Access to the latest clinical studies and ingredients ensures that our formulas are always one step ahead of the rest. Theorem products are scientifically proven to repair and improve your hair, no matter what type of hair you have! Our team has worked on 10’s of thousands of formulations throughout their careers. Theorem is the culmination of our most promising research, resulting in the first brand to devise a 3-dimensional solution to achieve thicker hair from root to tip!

Theorem Method

ZOE

NEVENA

VANNESA

ZOE

NEVENA

VANESA

This is the result after one use. Zoe and Nevena have been blow-dried. Vanessa is air dried.

Our Products

Our simple 3-part strengthening system may be used in conjunction
with your favorite shampoo and conditioner.

Square Root

Volumizing Root Serum.

For Fine, Thinning Hair.

Targets hair growth at the root. Thick hair begins with a healthy scalp, and this pH balanced serum plants the seed for dense, gorgeous hair. Square Root fights inflammation-related follicle narrowing, and restores pigment to gray hair naturally (with no dyes). DHT blockers inhibit hormonal hair fall and natural prebiotics promote a healthy, strong skin barrier. Also features a natural alternative to Minoxidil. Minoxidil is the only prescription hair growth ingredient that is FDA approved, but it comes with terrible side effects, which is why we use a safe and natural option instead.

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Density

Conditioning Treatment.

For chemically treated, colored or heat damaged hair.

There’s one very important cause of hair loss that is always overlooked: hair breakage. Weak strands with damaged cuticles break easily and hair just can’t grow long or thick. Theorem Density Conditioning Treatment repairs the hair cuticle to promote hair retention. The advanced, silicon-infused formula plumps up hair strands like an injectable filler. Works synergistically with heat to strengthen and thicken hair strands, giving you the length and shine you deserve.

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Sugar Pi

Damage Repair Oil.

For dry, frizzy hair and split ends.

No matter how fast your hair grows, split ends are an annoying obstacle between you and your long-hair goal progress. This deeply nourishing oil revives and mends split ends, enabling you to grow your hair longer without trimming away damage so frequently.
This sustainable, sugar-derived oil repairs damaged cuticles for strong, glossy, frizz-free hair. This naturally-derived, renewable complex is extracted from plant sugar, and microinjects a clinically-proven hair-healing form of Vitamin C into each hair strand to revive broken strands and split ends.

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Hypoallergenic

Hypoallergenic

Vegan

Vegan

Gluten-Free

Gluten-Free

No Animal Testing

No Animal Testing

Testimonials

Raquel S.

"Wow’d by the softness of my hair after using it once! "

Tiffany M.

"Smells amazing."

Jess V.

"Smells really good- love how my hair feels after one use."

Hannah L.

"I loved the way it feels on my hair. Super easy to brush through after the shower."

Alissa

"AMAZING PRODUCT! "

Valerie V.

"Loved it - using it since 03/2020"

Rebecca B.

"Loved it - using it since 03/2020"

Alex

"The smell was amazing! Hair was noticeably soothed."

Allison M.

"Loved the way the hair effortlessly blow dried out and have great shine."

Brooke D.

"My long hair is such a pain to brush and after one use I noticd it was smooth and much easier to comb through."

60-Days Guarantee

60-Days Guarantee

We have so much faith in our products that we offer a 60-day, no quibble, money-back guarantee. If you don’t love our products, just send it back to us for a full refund.

Shipping

Shipping

Once your order is confirmed shipped, you will receive your items in 5-7 business day.

Free Shipping

Free Shipping

Spend $50 or more
and shipping is on us!

60-Days Guarantee

60-Days Guarantee

We have so much faith in our products that we offer a 60-day, no quibble, money-back guarantee. If you don’t love our products, just send it back to us for a full refund.

Shipping

Shipping

Once your order is confirmed shipped, you will receive your items in 5-7 business day.

Free Shipping

Free Shipping

Spend $50 or more
and shipping is on us!

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