Look for hydrolyzed keratin

Sears say hydrolyzed keratin is the ideal type of keratin to look for in your keratin shampoo. "Hydrolyzed keratin means that the molecule is small enough to fill the cracks on the bits of my hair that could be weak, while also getting into the hair shaft to give some love to the cortex as well," she explains.

Consider skipping the sulfates

Listen, sulfates have a time and a place, and while some people can actually benefit from using sulfated detergents, it's probs best to skip 'em if you're someone damaged or chemically-treated hair. ICYDK, sulfates are harsh surfactants that can strip away your hair and scalp's natural oils, so those with hair in need of some TLC should typically steer clear.

Think about your hair type

Keratin shampoos come in varieties for all hair types and texture, so it's important to keep yours in mind when choosing a formula. If your hair is on the finer side, something that boasts hydrating and moisturizing properties may be too heavy for you (especially since a keratin coating already adds some weight). “This can add unwanted product to your hair and weigh it down,” explains hair stylist Stephanie Angelone. On the other hand, if your hair is super thick or coarse, you’re going to want to look for those emollient-packed and moisturizing formulations to keep hair hydrated.

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