Count the oils. Marula, coconut, avocado, sweet almond, coffee, kukui, cumaru and shea butter: eight fats between the sixth and twenty-fourth positions of a shampoo's ingredient list, which is a lot of lipid for a product whose surfactants exist to emulsify lipid and carry it down the drain. Most of them go. What Acure's Simply Smoothing Shampoo leaves behind is decided further down the list by two ingredients nobody buys it for: guar hydroxypropyltrimonium chloride and cocoglucosides hydroxypropyltrimonium chloride, cationic polymers that deposit on the hair as the lather dilutes and lay the cuticle down. That is the smoothing, and having two of them rather than one is the real difference between this and the brand's hydrating shampoo. The oils make the lather richer and the wash feel less stripping, which matters too, and is a different thing from what the front of the bottle suggests.
The cleaning base is Acure's current standard and a good one: cocamidopropyl betaine and sodium lauroyl methyl isethionate, backed by glutamate and taurate surfactants, a mild blend that foams properly and does not roughen the cuticle the way sulfates do. For a shampoo whose promise is smoothness, not creating frizz in the first place is most of the work, and this base does it. Aloe juice fourth and glycerin fifth keep the scalp from tightening, and the lather that results is denser and creamier than a sulfate-free shampoo usually manages, which the couple of dozen reviewers on Acure's site notice first.
On the hair the result depends on the hair. Coarse, wavy and frizz-prone lengths come out of the shower slick and sealed, dry with less halo, and take a serum well; that is the audience, and the shampoo serves it. Fine hair tells a different story: the trace of oil that does deposit, along with the polymers, produces a softness that reads as weight by the second day, and the sensible fixes are a smaller amount, a thorough rinse and a clarifying wash every week or two. Tightly coiled hair gets a gentle wash and nothing like enough conditioning, which no shampoo provides.
Two habits improve it. Rinse for longer than feels natural, because the polymers deposit as the lather dilutes and a quick rinse leaves them in the drain along with the surfactant; and wash the scalp rather than the lengths, letting the foam run down the hair on its way out, which cleans where the oil is and leaves the dry ends the slick coating they came for. Used that way the shampoo's richness stops being a liability on all but the finest hair, and on coarse hair it becomes the reason to keep buying it.
The pairing matters too. The matching Simply Smoothing Conditioner is built on the same scent and the same oils, and the two are clearly meant to be used together; a smoothing shampoo followed by a hydrating conditioner from another line will smell like two products and behave like one, which is fine, but the set is where Acure's frizz claim comes closest to holding.
The named heroes deserve a plain word. Coconut liquid endosperm is coconut water, which in a rinse-off is a flavoured share of the water phase and hydrates hair no more than the tap does; marula oil at seventh is a pleasant light oleic oil that enriches the lather and is then mostly emulsified away. The seven certified-organic fruit and flower extracts between them, blackberry through pomegranate, are Acure's house signature and contribute nothing that survives a rinse. None of this makes the shampoo worse than it is; it makes the label a poor guide to why it works.
The scent is where a careful reader should slow down. Acure's rule is no synthetic fragrance, and this shampoo keeps it with clove, orange and Texas cedarwood essential oils plus vanillin, and the label declares limonene separately because it is a listed allergen. The blend is warm, spiced-orange and more assertive than the brand's almond washes, and it lingers on dry hair, which many people enjoy. It is also, in dermatological terms, a fragrance like any other: eugenol from clove and limonene from citrus are among the most frequently positive natural fragrance sensitisers in patch-test clinics, and cocamidopropyl betaine adds the small, well-known risk of betaine dermatitis. A healthy scalp will not notice. A reactive one has no reason to prefer this over a conventionally scented shampoo and good reason to prefer a fragrance-free one.
Price and provenance are the shampoo's friends. Nine ninety-nine for eight ounces, and often less through Acure's rolling promotions or at Target, is at the cheap end of sulfate-free smoothing shampoos, and a bottle lasts six to eight weeks for shoulder-length hair washed every other day. Acure has been on mass-retail shelves since 2010, the Simply Smoothing pair since about 2019, and the brand's vegan and Leaping Bunny certifications are real if not dermatological. The formula has been revised onto the isethionate base since launch, so older reviews describe an earlier version.
The recommendation, then, is a matched one. Coarse, wavy and frizz-prone hair without a sensitive scalp will find this a rich, gentle, nicely scented wash that makes the lengths easier to smooth afterward, at a price that invites trying it. Fine hair should use it sparingly or choose the brand's lighter variants. Anyone whose scalp reacts to essential oils should skip it, and anyone buying it for the marula and coconut water should know that the ingredients keeping their hair sleek are two polymers they have never heard of.
