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The Theorem Method is a 3-part hair care system used to achieve thicker hair from root to tip. These products take a comprehensive approach to strengthening and thickening your hair. Our formulas are precisely pH-balanced to promote a healthy scalp, follicle, cuticle, and hair cortex. Watch as the clinically-proven formulas strengthen and thicken your strands, giving you the length, shine, and fullness you desire. Best used in conjunction with each other but can be used as separate products based on your hair care needs.
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Dermatologist Tested
Vegan
Gluten-Free
No Animal Testing
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.
Damage Recovery 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.
Deep Conditioning Repair Mask.
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 Mask 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.
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 her 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.
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
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
Once your order is confirmed shipped, you will receive your items in 5-7 business day.
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Curl Cream
Enhance & define curls
Blowout Styling Balm
Eliminate frizz and protect from heat
Hydration Shampoo
For fine, thin or flat hair.
Hydration Conditioner
For dry, damaged or frizzy hair
Hydration Shampoo & Conditioner
Texturizing Shampoo
Texturizing Conditioner
Texturizing Shampoo & Conditioner
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.
Touch-Up Smoothing Milk
For all hair types
Nourishing Scalp Oil
For dry hair and scalp
Soft Curls Leave-In Conditioner
For wavy, curly, coily, textured and porous hair types
Conditioning Curl Cleanser
For naturally wavy or curly hair
For fine, thin or flat hair
Blonde Boosting Shampoo
For blonde, highlighted or gray hair
Blonde Boosting Conditioner
Blonde Boosting Duo
"Smells really good- love how my hair feels after one use."
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