The Holy Guide

Haircare, explained properly.

A growing library of articles on ingredients, formulation, and what actually matters when you pick up a bottle. 

Written for curious people, not chemists.

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Hair

Is Sodium Laureth Sulfate Bad for Your Hair? The Truth About This Common Cleanser

Sodium laureth sulfate is a widely studied surfactant that is considered safe for most people at the concentrations used in rinse-off products.

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ROSEMARY OIL FOR HAIR GROWTH

Rosemary Oil for Hair Growth: What It Is, What the Science Says, and Why We Use It

Rosemary oil, listed on ingredient labels as Rosmarinus officinalis leaf oil, is a plant-derived essential oil with a growing body of clinical evidence linking it to improved hair density and reduced hair loss.

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ARGAN OIL FOR HAIR

Argan Oil for Hair: What It Is, What It Does, and Why We Use It

Argan oil, pressed from the kernels of the Argania spinosa tree, is rich in oleic acid, linoleic acid, and tocopherols (a form of vitamin E). Research shows it helps reduce friction between hair fibres, supports moisture retention, and protects hair from oxidative stress.

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INGREDIENT BREAKDOWN

Panthenol Hair Benefits: What Is It and What Does It Actually Do?

Panthenol is a form of vitamin B5 that penetrates the hair shaft, attracts moisture, and helps hair feel smoother and more elastic. 

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SHAMPOO

Methylisothiazolinone in Shampoo: What the Science Says and Why We Left It Out

Methylisothiazolinone (MI) is a preservative used in rinse-off and leave-on cosmetics to prevent microbial growth.

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CONDITIONER

Is Behentrimonium Chloride Safe in Conditioner? The Truth About This Key Conditioning Ingredient

Behentrimonium Chloride is derived from rapeseed oil, making it a plant-based ingredient rather than a purely syntheticx one.

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INGREDIENT BREAKDOWN

Nigella Sativa Seed Oil Hair Benefits: What It Is and What It Actually Does

Nigella Sativa Seed Oil can help support scalp comfort, reduce oxidative stress on the hair shaft, and deliver meaningful conditioning to dry or damaged hair.

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