The Secret Ingredients For Perfectly Defined Curls

Take it from Andrea K. Castillo, a Brooklyn-based entrepreneur and model who's got the art down to a science.
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Doreen Pierre/HuffPost

If anyone knows a thing or two about embracing their naturally curly hair, it’s Andrea K. Castillo, a Brooklyn-born and based entrepreneur and model who rocks her perfectly defined curls for photo shoots and public appearances on a regular basis. 

Some people prefer straightening their curls, but Castillo leans into her natural hair texture by creating the perfect cocktail of products to make her strands pop.

All curly hair textures require plenty of moisture, so Castillo is careful about selecting products that won’t strip natural oils. To keep her locks hydrated and looking their best, she has an arsenal of cleansers, conditioners, treatments and stylers that she uses to create an enviable and polished look. Below, she shares her go-to products for picture-perfect curls.

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Camille Rose Rose Cleansing Milk

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Camille Rose

“I really enjoy this cleansing milk, as it is super-soft and hydrating and doesn’t strip my strands. After soaking my strands in the shower, I section my hair out into about four sections, liberally apply product throughout, comb through with a wide-tooth comb and rinse out thoroughly.”

Briogeo Don’t Despair, Repair! Deep Conditioning Mask

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Briogeo

“This has been my favorite deep conditioner for years, hands down. I have been hip to Briogeo for years now, and their deep conditioning mask was one of the first products I tried. I love the clean ingredients and scent, and the fact that it leaves my curls super-hydrated without having to keep the product in for hours.”

Olaplex No. 3 Hair Perfector

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Olaplex

“I’ve always been concerned about my curl definition, and I noticed from countless scrolls on Instagram and asking my Twitter friends for suggestions that Olaplex’s No. 3 treatment was what many of the curly girls have been using to achieve such great results. I have noticed a difference in using the product after many weeks, which is amazing. Although their site says to use it once a week, Candace, my stylist at Candace Witherspoon Salon, suggests using it once a month as it is a bond repairer, not a hydrating treatment.”

Kinky-Curly Original Curling Custard

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Kinky-Curly

“When it comes to styling, I like to keep it simple. Typically I have to use a leave-in conditioner, styling gel and styling cream, but the curling custard gives me all three in one, as it is super-moisturizing. Once the product is in, I generally air-dry for a few hours, and diffuse a bit at the end.”

Neon & Co. Treatment Oil

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Neon & Co.

“After my hair is completely dry and styled, I like to rake a quarter-sized amount of treatment oil through my hair, focusing on the ends and parts that tend to be dryer, mainly around the mid-crown. The base of the formula is macadamia nut, which is super-light and doesn’t weigh down my hair, while adding shine.” 

Agadir Argan Oil Spray Treatment

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Agade

“When my curls start to look sad or dirty and it’s time for a wash, I like to use this spray treatment all over my strands before cleansing. I definitely use it more in the summer months after the pool or beach. I spray it on while my hair is still wet from swimming, and let it do its thing on my commute back home.”

Unwash Bio Cleansing Conditioner

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Unwash

“Keeping my curls bouncy while trying to stay fit can sometimes be tricky. I am definitely one of those people who sweats a lot during workouts, so I need to wash my hair afterward so I don’t feel gross. I tried this cleansing conditioner a few years ago and it is still one of my favorites. I use it as a co-wash after workouts or on generally hot summer days. It is super-moisturizing, so I am able to style my hair normally afterward.”

Curls Lavish Curls Moisturizer

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Curls

“Second-day curls can be great or terrible, depending on how you sleep the night before. When mine are looking a little limp or flat, I like to dampen my strands a bit and work Lavish Curls Moisturizer through the parts that have lost definition.”

Before You Go

Frizz-Fighting Hair Products For Summer Humidity
ColorWOW Dream Coat Anti-Frizz Treatment(01 of10)
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In-salon keratin treatments may keep your locks smooth and sleek during the summer months, but they are also costly to maintain. Treat your locks to an at-home frizz treatment that won’t break the bank with the Dream Coat. "This a great blow-drying product — which lasts between three to four shampoos — to consider. It activates with heat and tension to seal out moisture, and keeps the hair smooth without being flat," licensed hairstylist Andrea Claire said.

Get ColorWOW Dream Coat Anti-Frizz Treatment for $28.
(credit:ColorWow)
Iles Formula Finishing Serum(02 of10)
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Like skin care, some luxury hair essentials are worth indulging in. If you want to stop frizz while your hair is still wet, Claire said this luxury leave-in product is sure to be your BFF all summer long. “This hair serum is akin to a luxe leave-in conditioner with added UV and heat protection to boot,” she said. "I use this on all hair types (curly, straight, 1-4C, etc.) and the results are excellent."

Get Iles Formula Finishing Serum for $50.
(credit:Iles Formula)
Oribe Impermeable Anti-Humidity Spray(03 of10)
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Tired of using frizz-eliminating hair sprays that don’t work? Claire suggested switching to this anti-humidity spray, as “it keeps your blowout pristine by blowing out the moisture in the air.”

This product isn't for everyone, though. “It may be too heavy for finer hair textures and can flatten the style," Claire said.

Get Oribe Impermeable Anti-Humidity Spray for $42.
(credit:Oribe)
Nunzio Saviano Anti-Frizz Sheets(04 of10)
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Just like dryer sheets cut down on static, “these anti-frizz sheets (which can be used on all hair types) beat static and frizz on-the-go, even when the humidity is sky high," New York-based hairstylist Nunzio Saviano said.

But that’s not all these sheets can do. “In addition to taming flyaways, these sheets also add shine and provide UV benefits to the hair, making it the perfect item to keep in your beach bag all summer long,” Saviano added.

Get Nunzio Saviano Anti-Frizz Sheets for $18.
(credit:Nunzio)
Olaplex No. 6 Bond Smoother(05 of10)
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Humidity creates frizz by taking the moisture out of your hair, celebrity hair stylist Chad Kenyon told HuffPost.

Because of this, he advised switching to this leave-in frizz cream. “It contains patented bond-building technology to relink hair bonds and can also reduce frizz, and speed up drying time,” he said.

Get Olaplex No. 6 Bond Smoother for $28.
(credit:Olaplex)
Calista StyleDryer Pro Hair Drying Brush(06 of10)
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“Pro tools are essential in keeping frizz to a minimum,” veteran stylist and salon owner Maria McCool said. “If you don’t want to use a clunky dryer to dry your hair, switch to this drying brush. It uses fusion technology to stop frizz and add fullness and shine.”

Get Calista StyleDryer Pro Hair Drying Brush for $69.
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Kitsch Satin Pillowcase(07 of10)
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Yes, even your pillowcase can be a contributor to your frizz. "Friction from a cotton pillowcase often causes it," McCool said, but added that remedying this problem is an easy fix. “Switching to a satiny silk pillowcase can smoothen down frazzled locks as you snooze,” she said.

Get the Kitsch Satin Pillowcase for $19.
(credit:Kitsch)
Paul Labrecque Color Finish Polish & Seal Droplets(08 of10)
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To ensure your hair stays shiny and frizz-free for the entire duration of your blowout, celebrity hairstylist Paul Labrecque makes these nondrying, alcohol-free silicone droplets that “keep the hair from swelling as nature does its thing,” he said. Plus, its lightweight texture and UV filters prevent color fade and discoloration, making it a summer multitasker.

Get Paul Labrecque Color Finish Polish & Seal Droplets for $24.
(credit:Paul LaBrecque)
Hair Play Set 3 Extra Hold Styling Foam(09 of10)
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Mousse may bring images of dry and straw-like hair to mind, but Claire said this product isn't anything like mousse from the ’90s. “This moisturizing liquid hair foam is in an air pump, making it similar to mousse, but without the drying effects some mousse products have,” Claire told HuffPost. “It’s great for all hair types. I have used it for diffusing curly hair, or as a blowout product to block out humidity.”

Get Hair Play Set 3 Extra Hold Styling Foam for $24.
(credit:Hair Play)
Jamaican Black Castor Oil Growth Serum(10 of10)
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Frizz can be caused by a myriad of reasons, including overwashing and using harsh products (containing sulfates and parabens) that strip away your hair's natural oils, according to natural hair care expert Muhga Eltigani. To achieve healthier and bouncier tresses, Eltigani advised using this growth serum on your hair and scalp (or as a hot oil treatment). “It replenishes the sebum on your scalp, doesn't leave a greasy residue or clog pores," she said. "It also brings balance to your natural oil levels, making it a great product to use, even if your scalp is too oily.”

Get Jamaican Black Castor Oil Growth Serum for $15.50.
(credit:NaturAll)

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