Keratin treatments are an investment in smooth, frizz-free hair, and keeping that finish intact depends on what you reach for in the shower. The wrong formula can strip the treatment in a few washes, leaving you with the same puffiness you started with. The right conditioner pampers chemically smoothed strands while extending the life of the service. These ten picks cover a useful range of formats, sizes, and ingredient profiles so you can match a routine to your hair type, color status, and budget.
A Side-By-Side Look
Stream2Sea Leave-In Conditioner with UV Protection
Loma Nourishing Conditioner 33 Ounce (Liter)
Biotop Professional 911 Quinoa Hair Conditioner 33.8oz
OUAI Medium Conditioner Refill 32 Oz
Keratin Complex Color Care Smoothing Conditioner
Keratin Complex Multi-Benefit Treatment Spray 5 fl oz
Keratin Complex Styling Lotion 5 fl oz
MAREE Deep Conditioning Hair Mask 10 Fl Oz (White)
MAREE Deep Conditioning Hair Mask 6.7 Fl Oz (Brown)
MAREE Deep Conditioning Hair Mask 10 Fl Oz (Purple)
What Each Pick Brings To The Table
Pool days and beach vacations are the enemy of a fresh keratin service, and this Stream2Sea leave-in is built around that exact problem. The formula is sulfate- and paraben-free, which matters because harsh surfactants are the fastest way to lift a keratin coating out of the cuticle. The reef-safe designation also makes it easier to justify for ocean swimmers who care about what rinses off their scalp.
What sets it apart from the Loma and Biotop picks later on this list is the UV protection layer. Keratin-treated hair tends to fade faster in direct sun, so a leave-in that shields against UV while softening strands handles two concerns at once. It’s a spray format, so a quick morning spritz replaces a heavier cream routine during hot months.
Where It Helps
- Sulfate- and paraben-free, gentle on chemically smoothed hair
- UV protection helps preserve color and keratin treatment longevity
- Lightweight, non-greasy texture suited to fine or sun-exposed hair
- Reef-safe formulation suits ocean swimmers and travelers
Points To Keep In Mind
- Leave-in sprays need reapplication after swimming or heavy sweating
- Lighter hydration may not satisfy very thick or coarse textures
Feature Snapshot
Whose Shelf It Belongs On
Anyone with a fresh keratin service who spends weekends at the beach or pool and wants a lightweight, UV-aware leave-in.
A Better Fit Elsewhere
Reach for Loma Nourishing Conditioner instead if your hair is thick, very dry, and needs a richer rinse-out formula in a larger size.
The liter format on Loma Nourishing Conditioner is the headline feature before you even read the label. For daily washers, a one-liter bottle lasts months, which softens the per-use cost compared to a smaller pump bottle. The formula itself skips sulfates, parabens, and gluten, a useful trio for anyone layering multiple chemical services on already-processed hair.
Unlike the Stream2Sea leave-in above, this is a traditional rinse-out conditioner aimed at replenishing thirsty strands. Loma has long positioned this product as a reparative formula for dry and overworked hair, and the texture feels creamier in the hand. It plays nicely with keratin-treated hair because it focuses on moisture without aggressive cleansing agents.
Where It Excels
- Large liter size offers strong long-term value for daily users
- Free of sulfates, parabens, and gluten for sensitive scalps
- Moisture-focused formula suits thick or coarse textures
Trade-Offs
- Larger bottle can be awkward in a small shower caddy
- Heavier cream texture may weigh down very fine hair
- Lacks UV protection compared to spray-style leave-ins
Right Fit For
Anyone who washes often, has medium-to-thick hair, and wants a salon-style liter bottle they won’t run out of mid-month.
Skip It When
The Stream2Sea Leave-In Conditioner is a smarter match for fine hair that gets greasy quickly with heavier creams.
Quinoa is a less common protein source in mainstream conditioners, which is exactly why Biotop’s 911 formula earns a place on this list. Protein helps patch weakened areas along the hair shaft, and quinoa protein in particular is gentle enough to use on processed hair without leaving a stiff, brittle feel. The 33.8-ounce bottle puts it in the same bulk range as the Loma liter.
The conditioner also targets pH balance, which matters more than most shoppers realize. Highly alkaline products raise the hair cuticle, and a raised cuticle is what causes frizz and dullness, the very things a keratin service is meant to fix. Compared with the OUAI refill on this list, the Biotop leans more toward repair than everyday smoothness.
The Practical Payoff
- Quinoa protein for gentle strengthening on damaged strands
- pH-balancing approach supports smoother cuticle behavior
- Safe for color-treated hair alongside keratin services
- Bulk 33.8-ounce bottle suits regular washers
Honest Caveats
- Bottle lacks a pump, so pouring requires care in a wet shower
- Protein-leaning formulas can build up on very fine hair over time
Made For
People with dry ends, color-treated hair, or post-keratin dryness who want a protein-forward conditioner in a generous size.
Not Your Match When
The OUAI Medium Conditioner Refill is a friendlier everyday option for shoppers prioritizing a lighter, more universal texture.
OUAI built this Medium Conditioner for hair that falls in the middle: not pin-straight and fine, not coarse and curly. The refill pouch format is the quiet win here, because it cuts down on plastic and typically costs less per ounce than the brand’s pump bottle. If you’ve already emptied an OUAI conditioner before, you know the texture and scent profile.
Where the Loma and Biotop picks lean rich and protein-heavy, OUAI’s formula uses lightweight oils to hydrate without flattening volume. That makes it a strong everyday match for the medium-textured crowd who want softness without the limp feeling heavier creams can leave behind. It also works on hair that’s been keratin treated, though it doesn’t market itself as a keratin-specific formula.
Points In Its Favor
- Refill pouch format reduces packaging waste
- Lightweight hydration suits medium-textured hair
- More accessible price point than the pump bottle version
A Few Limitations
- Refill pouch can be awkward to store and pour from
- May not deliver enough moisture for very thick or curly textures
- Scent is stronger than some shoppers prefer
Best Suited To
Anyone with medium-textured, normal-to-dry hair who wants a lighter everyday conditioner and prefers refill packaging.
Consider Something Else When
Choose Loma Nourishing Conditioner for very thick or curly strands that need more conditioning slip per wash.
Keratin Complex makes the list twice for good reason: the brand builds its formulas around keratin, which is what shoppers with keratin-treated hair are actively trying to maintain. This Color Care conditioner layers in wheat and soy proteins alongside its signature keratin to support moisture retention and a glossy finish on color-treated strands.
The standout feature is pro-vitamin B5, which acts as a humectant (a moisture-binding ingredient) to keep hair hydrated between washes. Unlike the Loma and Biotop picks that target dryness broadly, this formula pairs smoothing with color protection, useful if your hair is both keratin-treated and dyed. The texture lands somewhere between creamy and light, so most hair types tolerate it well.
What Earns Its Place
- Color-safe formulation protects dyed hair alongside keratin
- Keratin, wheat, and soy proteins support moisture retention
- Pro-vitamin B5 helps bind hydration between washes
- Designed for a glossy, smooth finish on dull strands
Where It May Fall Short
- Protein-rich formulas can over-build on hair that already gets protein treatments
- Scent profile may be stronger than unscented shoppers expect
Who Should Grab It
Color-treated shoppers who also maintain a keratin service and want a single conditioner that addresses both concerns.
Reach For A Different Pick When
The Keratin Complex Multi-Benefit Treatment Spray is a smarter grab for frizz control between washes without a full conditioning session.
This 5-ounce spray is the smallest format in the roundup, which is exactly the point. A rinse-out conditioner in a liter bottle is great for the home shower but useless in a gym bag. Keratin Complex leans into the leave-in treatment category here, with hydrolyzed silk amino acids and coconut oil doing the heavy lifting alongside keratin.
The spray is designed to cut down blow-dry time and add light hold, useful on busy mornings or in humid climates where frizz spikes. Compared with the Color Care Smoothing Conditioner above, this one trades deep conditioning for a quicker, lighter finish. It also layers nicely as a follow-up to either of the MAREE masks later in the list.
Useful Strengths
- Compact 5-ounce size fits in carry-ons and gym bags
- Spray format speeds up morning routines and detangling
- Silk amino acids and coconut oil nourish without heaviness
- Lightweight enough for daily use without buildup
Things To Weigh
- Smaller bottle means more frequent repurchasing
- Sprays don’t deliver the deep conditioning of a mask or cream rinse
Who It Suits Best
Travelers, gym-goers, and anyone who needs a portable keratin-friendly product for quick touch-ups between washes.
Where Another Pick Suits Better
The Loma Nourishing Conditioner is a stronger match for at-home washers who want a full-size rinse-out over a travel spray.
The Styling Lotion is technically not a conditioner, but it earns its spot because it serves the same goal as the rest of the list: keeping keratin-treated hair looking smooth. Heat styling is one of the quickest ways to undo a keratin service, and this lotion pairs a light hold with antioxidants that help defend against thermal damage.
It also includes UV protection, which pairs nicely with the Stream2Sea leave-in earlier in the list if sun exposure is part of your routine. The formula skips parabens and SLS, two ingredients worth avoiding when you’ve invested in a smoothing treatment. Unlike the Multi-Benefit Treatment Spray, this lotion is geared toward styled looks rather than quick detangling.
Real-World Strengths
- Light hold secures blowouts without stiffness or crunch
- Antioxidants help defend hair during heat styling
- UV protectant layer addresses sun-related fading
- Free of parabens and SLS for processed hair
Less Ideal Details
- Smaller 5-ounce bottle runs out faster than pump conditioners
- Lighter hold won’t suit shoppers wanting firm control
Perfect Match For
Anyone who regularly blow-dries or flat-iron keratin-treated hair and wants a thermal-aware styling companion.
Swap It Out When
Pick the Keratin Complex Multi-Benefit Treatment Spray instead if you want detangling and frizz control without the styling hold.
A deep conditioning mask is a different category than a daily conditioner, and MAREE’s white jar is built for once-or-twice-weekly use rather than every wash. The formula includes keratin, biotin, and coconut oil, three ingredients that show up repeatedly across this list for good reason: they each target a different aspect of damage from smoothing treatments and color processing.
The 10-ounce jar sits in a middle ground between the Loma liter and the smaller MAREE brown jar further down. Unlike a rinse-out conditioner that you leave on for two minutes, a mask works best with five to ten minutes of contact time, so plan accordingly. It also doubles as a pre-shampoo treatment on very dry ends.
Why It Works Well
- Keratin, biotin, and coconut oil combo addresses multiple damage signs
- Mid-size jar is manageable for weekly users
- Works on dry, damaged, and color-treated hair types
- Versatile as a mask or pre-shampoo treatment
What To Weigh
- Mask format requires longer contact time than daily conditioners
- Results vary based on hair type and application method
Built With In Mind
Weekly maskers who want a mid-size jar for routine deep conditioning without committing to a salon liter.
Another Choice May Suit
The MAREE 6.7-ounce brown jar is a better fit for anyone wanting a smaller, travel-friendly starting point before a full-size commitment.
The brown 6.7-ounce jar is the smallest of the three MAREE options, and it fills a specific gap: trying a mask before committing to a larger tub. The formula is identical to the white and purple jars, so shoppers choosing among them are really choosing size and aesthetics rather than performance.
Where this jar shines is in gym bags and travel kits. Masks in full-size jars are heavy and prone to leaking in transit, and a 6.7-ounce container fits more easily into a weekend bag. Compared with the 10-ounce white jar earlier, you trade a few extra uses for portability, useful for frequent travelers with keratin-treated hair.
Positive Takeaways
- Compact 6.7-ounce size fits easily in travel kits
- Same core formula as the larger MAREE jars
- Lower upfront cost to trial the mask
Things To Consider
- Smaller jar runs out faster for weekly users
- Mask still requires longer contact time than rinse-out conditioners
- Travel-friendly tub may not last a full month of weekly use
Who Will Love This
Frequent travelers and anyone wanting to test MAREE’s mask formula before stepping up to the larger 10-ounce jars.
Look Elsewhere When
Choose the MAREE 10-ounce white jar instead for home use where you can keep a larger tub in the shower.
The purple jar wraps up the roundup with the same 10-ounce size as the white version but with a packaging variant that suits a slightly different buyer. If you keep multiple masks in rotation, the color difference helps you grab the right one without reading labels in a steamy bathroom.
The formula, like the other MAREE options, leans on keratin, biotin, and coconut oil for hydration and repair. For curly and color-treated textures especially, masks tend to outperform daily conditioners because of the longer contact time. Pairing this with a lighter daily conditioner like the OUAI refill makes a balanced two-step routine.
Advantages To Know
- Color-coded jar simplifies multi-mask routines
- Keratin, biotin, and coconut oil trio supports curl and color care
- Full 10-ounce size suits consistent weekly maskers
Where It Is Less Suited
- Results depend on hair type, condition, and application
- Mask format requires planning around longer wash-day routines
The Right Fit
Curly and color-treated shoppers who want a weekly mask and already use a separate daily conditioner.
Not Your Match When
The OUAI Medium Conditioner Refill is a better daily option for shoppers who haven’t yet added a weekly mask to their routine.
How To Choose The Right Conditioner For Keratin Treated Hair
Sulfate-Free Formulas Are Non-Negotiable
Sulfates are surfactants that create a strong lather, and they’re effective at cleansing oil and buildup. They’re also effective at stripping keratin from the hair shaft. After a smoothing service, every shampoo and conditioner in your routine should be sulfate-free, because even one or two sulfate washes can shorten the life of the treatment. Most of the picks on this list flag sulfate-free status, including Loma, Biotop, and all three Keratin Complex options.
Match Format To Your Routine
Daily conditioners, leave-in sprays, and weekly masks each serve different needs. A rinse-out conditioner handles everyday slip and detangling, while a leave-in spray or treatment adds UV protection and frizz control between washes. A deep conditioning mask is reserved for once-a-week use when strands need extra repair. Most people with keratin-treated hair end up using at least two formats from this list.
Consider Color Status And Hair Texture
If your hair is color-treated in addition to keratin-treated, look for a formula that handles both, like the Keratin Complex Color Care Smoothing Conditioner. Fine hair generally tolerates lighter textures (the OUAI refill or the Multi-Benefit Treatment Spray), while thick or curly textures usually need richer creams or masks like Loma or the MAREE jars.
Watch For Protein Sensitivity
Protein-based formulas like Biotop and the Keratin Complex conditioner can over-strengthen hair that’s already protein-balanced, leading to brittleness. Rotate with a moisturizing mask on alternating weeks and pay attention to how strands feel after each wash.
Key Considerations Across These Picks
Common Shopping Slip Ups
The biggest mistake is choosing a conditioner based purely on scent or packaging, then realizing it contains sulfates after the keratin service is already fading. Another frequent miss is buying a daily conditioner when a deep mask is what’s needed, or vice versa. Shoppers also tend to overlook travel-size options, then end up with a liter bottle they can’t pack. Across this list, a balanced routine usually pairs a rinse-out daily option with a mask or spray, not three of the same type.
Where The Extra Money Goes
Premium pricing in this category usually buys larger formats (the Loma liter), more sophisticated ingredient blends (Biotop’s quinoa protein), or brand prestige. The honest read is that a mid-tier conditioner and a weekly mask deliver most of the benefit for most shoppers, and paying more mostly adds format flexibility rather than dramatically better performance. Whether the upgrade is worth it depends on how often you wash and how much you rely on styling products between washes.
Frequently Asked Questions
How Often Should You Condition Keratin Treated Hair?
You can safely condition every wash, since sulfate-free formulas won’t strip the treatment. Many shoppers use a daily rinse-out conditioner and add a deep mask once a week for extra repair.
Can You Use Regular Conditioner On Keratin Treated Hair?
Regular conditioner is fine as long as it is sulfate- and paraben-free. Conditioners with harsh surfactants can shorten the life of a keratin service by lifting the smoothing agents out of the cuticle.
Should You Avoid Protein In Conditioners?
Protein helps repair damaged strands, but too much protein leaves fine hair feeling stiff. Alternate protein-rich conditioners with moisturizing masks on different weeks for balanced care.
Can You Use A Hair Mask After A Keratin Treatment?
Yes, and most keratin-treated hair benefits from a weekly deep conditioning mask to replenish moisture that the treatment can strip. Choose a mask with keratin, biotin, or coconut oil for the best results.
How Long Does A Keratin Treatment Last With Proper Care?
With sulfate-free products and limited heat styling, a keratin treatment can last several months. The exact duration depends on hair type, wash frequency, and how often you use heat tools.
Closing Thoughts
The right conditioner for keratin treated hair comes down to matching format, ingredients, and frequency to your real routine. A rinse-out daily conditioner, a leave-in spray or treatment, and a weekly mask cover most needs, and you don’t need every category to start. Pick one that fits your hair type and color status, use it consistently, and adjust as your strands respond.
