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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.
Volumizing Root Serum.
For Fine, Thinning Hair.
Deep Conditioning Repair Mask.
For chemically treated, colored or heat damaged hair.
Damage Recovery Oil.
For dry, frizzy hair and split ends.
Blonde Boosting Shampoo
For blonde, highlighted or gray hair
Blonde Boosting Conditioner
Blonde Boosting Duo
Hydration Shampoo
For dry, damaged or frizzy hair
Hydration Conditioner
Hydration Shampoo & Conditioner
Texturizing Shampoo
For fine, thin or flat hair
Texturizing Conditioner
Texturizing Shampoo & Conditioner
Curl Cream
Enhance & define curls
Blowout Styling Balm
Eliminate frizz and protect from heat
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.
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.
Free Shipping
Spend $65 or more and shipping is on us!
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.
2 fl oz | 59 ml
Ingredients: C13-15 Alkane, Caprylic/Capric Triglyceride, Squalane, Tetrahexyldecyl Ascorbate, Oryza Sativa (Rice) Bran Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Helianthus Annuus (Sunflower) Extract, Tocopherol, Fragrance, Benzyl Salicylate, Limonene, Hexyl Cinnamal, Hydroxycitronellal, Linalool, Alpha-Isomethyl Ionone
Directions: For Oily/Normal Hair: Apply sparingly to damp hair shaft and ends. Avoid roots. Style as usual. For Dry/Frizzy Hair: Apply generously on damp or dry hair, focusing on shaft and ends. When applied to dry hair, it may look wet and greasy. Allow 30 minutes for oil to soak in and soften hair. For split end damage: Apply to just the tips, wet or dry.
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Repeat after us, “I will never have a bad hair day again!”Subscribe & Save today for 10% off your order + for future deliveries, amp up the volume for up to 20% off.
After your first Subscribe & Save order, you will receive: 10% Discount: 1 Product 15% Discount: 2 Products 20% Discount: 3+ Products The more you buy, the more you save! Add new products, edit or postpone an order at any time! NO contract | NO fees | FREE shipping
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100% Satisfaction Guaranteed. Free Shipping on Orders over $65
Dermatologist Tested
Vegan
Gluten-Free
No Animal Testing
Traveling just got a whole lot sweeter this summer with our June Promo, a FREE travel-sized Density with any order of Sugar Pi. These two products work together to deeply nourish and revive your hair to ensure healthy, beautiful locks.
We know how damaging the pool, beach, and sun can be to your hair. This duo works together to prevent damage from occurring by strengthening your strands and sealing the cuticles. You won't want to forget these two hair heroes in your toiletry bag! They really know how to save the day.
Sugar PiNo 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.
DensityThere’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.
"Smells really good- love how her hair feels after one use."
For fine, thin or flat hair.
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