Curl products are usually marketed with a mood. I prefer the ones that start with a person, and As I Am leave-in conditioner comes with one. The brand's own homepage says chemist Dr. Ali Syed founded it in 2011, and describes him as a Pakistani refugee and chemist with 45 patents. It also positions him as a leading expert in curly hair, and says his family-owned business is at the origin of the curly hair industry. Those are the brand's statements, and I am quoting them as such, but a chemist-led shelf does explain why the formulas are so practical.

The leave-in is the center of it. The label-style description says the Leave-In Conditioner hydrates, softens and seals cuticles, and eases wet combing. The brand frames it as a prep and moisture base to use before gels, creams or jellies, with no rinse-out. It is made with coconut and shea, its ingredient list leads with coconut fruit extract and amla, and the brand lists it as sulfate, silicone and paraben free. That is the whole pitch, and it is a modest one. I like modest.

The grid gives you five versions. The classic Leave In Conditioner is the starting point. The Coconut Leave-in Conditioner leans into the coconut idea behind the brand's Classic Collection, which was crafted for curly and coily hair. Classic Moisture Milk is the lighter, more liquid take. The Onion Leave-in Conditioner is the unusual one on the shelf, and I would describe it only by its name and its label.

The Dry & Itchy Leave-In Conditioner belongs to a line I will only describe by what its label says. Read it, and if a scalp concern is persistent, that is a conversation for a dermatologist.

A leave-in is only one layer, so here is the rest of the shelf, and where each piece sits in a wash day.

Start with the cleansing step. The Coconut Cleansing Conditioner is a conditioner you wash with, made for curls and coils, and it suits anyone who finds shampoo leaves hair feeling stripped. The Dry and Itchy Shampoo and the Dry and Itchy CoWash come from the same line as the leave-in above, and I will say again that I describe them only by their labels: a shampoo and a cowash, for people who want their hair routine to stay gentle. The Dry and Itchy Oil is the finishing step in that line, a scalp and hair oil you would use sparingly.

Then there is styling. The Curling Jelly Definer is the one that does the most visible work. The brand's Curling Jelly page claims 72 percent curl retention after five hours in high humidity, and says it is made with shea butter and coconut oil. I treat that as the brand's own test rather than a promise, but the jelly does give curls a defined, softer-feeling finish when it goes over a leave-in base.

My order is simple. Cleanse, rinse, apply the leave-in to soaking wet hair, then the jelly, then leave it alone. Scrunching gently and not touching it while it dries is half the job, and it is the part nobody wants to hear.

Even a loyal fan should look around, because curls are individual and one brand will not suit everyone. These are the other leave-ins I would put next to the As I Am shelf.

Moroccanoil's All in One Leave-In Conditioner is the sleek, multi-job bottle, good for people with looser waves who want one product that does a bit of everything. Mielle's Pomegranate & Honey Leave-In Conditioner is the one I would pick for thicker, coily hair that likes a richer, sweeter-smelling creamy finish. Kinky-Curly's Knot Today Natural Leave In Detangler is exactly what the name says, and it earns its place on the bathroom shelf for tangled hair on a Sunday.

Ouidad's MOISTURE LOCK Leave-In Conditioner is the careful one, made for curls that dry out fast. Not Your Mother's Curl Talk Leave-In Conditioner is the easy-going option with a friendly personality. SheaMoisture's Manuka Honey & Mafura Oil Leave-In Conditioner is the one I would try if you like a creamy, buttery feel.

What I would skip: judging a leave-in after one wash. Curls change with weather, water and what you did last week, so give each bottle a few weeks. Also skip layering two leave-ins on top of each other, since that usually means heavy, flat hair and no useful information about either one. Change one thing at a time, and write down what you did.

Here is the routine I would hand to a friend with curls and a short attention span. Wash with something gentle, condition, and apply a leave-in on hair that is still dripping. Then add a jelly or cream if you want definition, and let the air do the rest.

The test is how your hair feels the next morning. You are looking for softer-feeling, more manageable curls, not a promise. If your hair feels coated or stiff, use less. If it feels dry by noon, add a bit more leave-in next time.

I like that the As I Am line was shaped by a chemist who spent his career on this exact texture, and that the shelf is organized around steps rather than hype. Pick the leave-in first, build outward, and read every label for what the brand actually says it does. If you want to keep browsing, I also put together The Best Leave-In Conditioner Has Quietly Replaced the Blowout Cream and CeraVe AM Facial Moisturizing Lotion SPF 30, Ceramides by Day.