Best Volumizing Shampoo and Tips to Fix Flat Hair

Finding the best volumizing shampoo is only the first step toward transforming your flat mane into one that speaks volumes. While flat hair certainly has its place in the styling world—we love it for aslicked-back look—a lack of volume can be frustrating if you are after a fuller, fluffier hairstyle.

If you are dealing with flat hair, you are probably wondering how to get more volume at the roots for a fuller mane. Ahead, we will explain what causes flat hair and share our best tips for giving your strands a much-needed boost. You will also discover our favorite volumizing products for flat hair, along with everything we know about adding volume to flat hair.

Why Do I Have Flat Hair?

Genetics, daily habits, and your lifestyle can all contribute to flat, limp hair. Understanding the specific drivers of your hair type can help you find a lasting flat hair fix.

• Your hair type: Naturally fine, straight hair lacks the structural diameter of thicker strands, which causes it to lie flatter against the scalp.
• Oil buildup and product weight: This is a primary driver of limpness; as natural oils and heavy styling residues accumulate at the scalp, they pull the hair downward, stripping it of its natural lift.
• Infrequent washing: When you skip shampoos, excess sebum builds up on the scalp, which eventually weighs your hair down and creates a greasy, flat appearance.
• The wrong products: Using conditioners or treatments that are too rich for your hair type coats the strands in heavy emollients, making your hair appear flat and lank.
• Over-styling: While certain products add volume, overusing them leads to product "crunch" and heaviness, which can result in limp-looking locks.
• Touching your hair too often: Every time you touch your mane, the oils from your fingertips transfer to your strands; this added oil contributes to a weighted-down, flat look.
• Hard water minerals: Showering in hard water allows calcium and magnesium to stick to your strands, creating a mineral film that causes hair to take on a limp appearance.

Flat hair vs. thin hair

To know if the best volumizing shampoo or any other flat hair fix will do the trick, it is important to distinguish between “flat hair” and “thin hair”. Understanding what’s happening to your hair will ensure you use the right solutions.

Flat hair refers to hair that lacks lift at the roots and lies close to the scalp. In contrast, thin hair refers to the actual density of hair follicles on the head. You can have thick hair that is flat, or thin hair that has plenty of volume.

How to Add Volume to Flat Hair

If you are trying to figure out how to fix flat hair, here are 20 tips that span wash day, styling, and haircut solutions. Keep reading to find the best volumizing shampoo and other volumizing products for flat hair, plus tricks that will surprise you.

1. Give your strands a detox

Buildup from styling products and minerals is one of the main causes of flat hair—and not even the best volumizing shampoo will help if your hair is weighed down by buildup. When your strands feel "coated" or sticky even after washing, your mane lacks shine, or the roots refuse to lift despite styling efforts, it is time to clarify your hair. For most hair types, a weekly detox is sufficient; those with oily scalps or who use heavy styling products daily may benefit from clarifying twice a week.

To help revive your limp hair and remove the stubborn buildup, try the L’Oréal Paris EverPure Sulfate-Free Clarifying Shampoo With Antioxidants and L’Oréal Paris EverPure Sulfate-Free Restoring Conditioner With Antioxidants. This dual-action system is formulated with antioxidants and a non-stripping formula that removes weighty residue and hard water minerals while keeping color-treated hair vibrant. The shampoo deep cleanses without the harshness of sulfates, while the restoring conditioner replenishes essential moisture to leave hair light, airy, and full of bounce.

2. Look for the best volumizing shampoo and conditioner

If buildup is not the issue, consider a volumizing shampoo for flat hair. Volumizing formulas work by utilizing lightweight, lift-focused ingredients that strengthen the hair fiber without leaving behind the heavy residues found in traditional smoothing products. These formulas are specifically designed to provide "root tension" and airy texture, ensuring that your strands remain bouncy rather than being pulled down by emollients.

One of the best volumizing shampoos is the L’Oréal Paris EverPure Sulfate-Free Volume Shampoo, paired with the L’Oréal Paris EverPure Sulfate-Free Volume Conditioner. This color-safe pair revives fine hair by infusing it with shine and lasting volume. Unlike heavy alternatives, these products focus on creating a weightless foundation that allows for maximum lift at the scalp. You can find more wash day tips in our article on how to wash thin hair properly.

3. Use a pre-shampoo scrub

While a monthly deep clean is ideal for most, you can use a scalp scrub once per week as part of an “everything shower” routine to maintain consistent root lift. Overusing these treatments can lead to scalp sensitivity, so finding the right cadence is key to preventing over-exfoliation. By clearing away the dense layer of oil, dead skin, and product debris that anchors hair to the scalp, you create the physical space necessary for your strands to stand upright at the follicle exit.

4. Don’t overdo it with conditioner

You have probably come across the question, “Does conditioner make your hair flat?” The answer is yes if you apply it to the wrong section of your mane. To avoid weighing down your strands, keep conditioner away from your roots and leave it only for the mid-lengths to the ends. A good visual cue is to start conditioning at ear-level or below.

5. Be choosy with your hair serums

Standard hair serums often feature rich, oil-heavy formats that can weigh down finer hair, but opting for lightweight formats like gels and mists can actually enhance your volume. It is also essential to differentiate between scalp-focused serums and length-focused moisture treatments to avoid a flat look.

For the scalp, look for exfoliating gel formulas that utilize precise dropper applicators to target the skin directly without coating the hair. The L’Oréal Paris Elvive Hyaluron + Pure Oil Erasing Serum For Oily Hair uses a 6% exfoliating complex with salicylic acid to target excess oil at the root. Apply this gel directly to a dry scalp, massage for five minutes, and leave it on for 15 minutes before rinsing to ensure your roots remain light and airy.

For your lengths, opt for a weightless mist or spray format rather than a thick, oil-heavy liquid. The L’Oréal Paris Elvive Hyaluron + Plump Moisture Plump Serum, Paraben-Free is a daily leave-in spray formulated with hyaluronic acid. This lightweight mist rehydrates dry strands and increases hair diameter without adding weight, leaving your hair shinier, bouncier, and fuller-feeling.

6. Turn to dry shampoo

If greasy roots are causing limp hair but you do not have time to do a full wash with the best volumizing shampoo you have, reach for dry shampoo to soak up excess oils. For a targeted flat hair fix, hold the can 6 to 10 inches away from your head and apply the spray to one-inch sections at the root. Once applied, massage the product into your scalp with your fingertips to ensure even distribution and maximum lift.

Keep in mind that when it comes to dry shampoo, less is more. Using too much product can contribute to the same heavy buildup discussed in our detox section, which eventually leaves your hair appearing flat and lank rather than full and bouncy.

7. Tease your roots

Teasing is a styling trick that instantly helps when you are learning how to fix flat hair. Use a fine-toothed comb to gently back-comb the underside of three-inch sections at the crown. Be sure to use a gentle technique to avoid breakage and pair it with a light-hold spray for longevity, such as the L’Oréal Paris Elnett Satin Hairspray Extra Strong Hold.

8. Rock voluminous curls

To give your tresses a thicker appearance, use a large-barrel curling iron (around 1.25 to 1.5 inches) to add loose, voluminous ringlets; larger barrels are ideal for creating body and movement, whereas smaller barrels create tighter curl definition that can weigh down the hair. For maximum fullness, alternate the direction of each curl—curling one section toward your face and the next away—to prevent the curls from "nesting" together and falling flat.

Once your curls have cooled, finger-comb them to loosen the shape and finish with the L'Oréal Paris Advanced Hairstyle Lock It Weather Control Hairspray to lock the style in place.

9. Try a texturizing paste

If you have shorter hair or a layered cut, a texturizing paste is a great flat hair fix for creating piecy, defined volume. While heavier than a mousse, it offers more control for targeted styling on pixie cuts, bobs, and lobs. A great example is the L’Oréal Paris Studio Line Overworked Hair Putty, which helps thicken hair while providing a workable hold. Work a small amount through damp or dry hair for a textured, voluminous look that does not require heat.

10. Use a volumizing mousse

Volumizing products for flat hair, like mousse, are best for all-over body on medium-to-long hair types. Unlike the targeted texture of a paste, mousse provides weightless lift from the roots to the ends, making it the better choice for blowouts or air-dried waves on longer lengths. For those with limp hair, we recommend the L’Oréal Paris Advanced Hairstyle BOOST IT Volume Inject Mousse, which provides up to 24 hours of lightweight volume. Apply it to damp hair for maximum lift.

11. Blow it out

There is a reason your mane looks so voluptuous when you leave the salon: the professional blowout. While you can visit a salon, you can achieve a similar height at home by focusing on root tension. Use a medium-to-large round brush to pull the hair upward and away from the scalp as you blow. A larger barrel size provides the necessary surface area to lift the hair at the base without creating tight curls.

For a full tutorial, check out ourguide to at-home blowouts.

12. Blow-dry your hair upside down

You do not have to commit to a full blowout to achieve fuller locks at home. Simply blow-drying your hair upside down is a reliable way to add volume to flat hair by encouraging the roots to dry in an upward position. For longer-lasting lift, use the cool shot button on your dryer to set the lift in place before flipping your hair back upright. Remember to alwaysuse a heat protectant, like theL'Oréal Paris Elvive Dream Lengths Heat Slayer Leave-In, to shield your hair from damage.

13. Put it up

If you are a fan of multitasking, you will be happy to know that there are temporary hacks to lift flat hair that cut down on prep time. One of those is pulling your hair up into a high, loose bun at the crown of your head while it is slightly damp. Secure it with a silk scrunchie to avoid leaving any ridges and allow it to dry for 1-2 hours while you finish your morning routine, then take out the bun to reveal instantly lifted roots.

14. Use a hairpiece

The best volumizing shampoo and other volumizing products for flat hair are never the only solutions. To instantly create the illusion of fuller hair, consider reaching for a hairpiece specifically designed for your styling goals. It is helpful to differentiate between pieces meant for crown volume—which sit at the top of the head to provide height—and those designed for length fullness, like traditional wefts that add density to your ends.

If you’ve never tried this, go for halo or clip-in extensions because they are easy to apply and remove. When placing your hairpiece, ensure it is anchored securely to a sturdy section of hair rather than fine strands at the hairline to achieve the most natural, voluminous look.

15. Try hair extensions

If you are looking for a more long-term solution compared to the temporary lift provided by hairpieces, permanent hair extensions might be for you. Unlike clip-ins, these are a significant investment both in cost and time, requiring a visit to an experienced stylist for application and professional maintenance every six to eight weeks. In exchange for the higher cost and upkeep, you will enjoy consistent volume that lasts for months.

16. Sport a double ponytail

Give limp hair a new lease on life by propping a ponytail up with another pony placed directly beneath it. This stacked technique creates the illusion of a thicker, more voluminous updo by adding significant length and height to the hair. For best results, this hack is recommended for medium to long hair lengths, as shorter strands may not adequately hide the secondary elastic. Beyond just adding body, the high-placed top ponytail can help elongate a rounder face shape, providing a flattering, illusion-based volume benefit that makes your mane appear twice as dense.

17. Give rollers a try

Using rollers can instantly give limp hair life. Choose the right size for your goals: If you are after maximum root lift and soft body, choose large rollers (two inches or wider). For actual curl definition, opt for medium sizes (one to 1.5 inches).

For a quick lift before heading out, you can use hot rollers. These use heat to "set" the hair quickly, usually within 20 minutes. If you have more time and want a damage-free result, use foam rollers or flexi-rods on slightly damp hair overnight. The extended drying time ensures a longer-lasting, bouncy finish that stays put all day.

18. Finish with volumizing hairspray

The right hairspray sets your style without causing it to collapse under its own weight. We recommend looking for a lightweight, brushable formula that provides hold without visible residue, such as the L’Oréal Paris Elnett Satin Strong Hold Hairspray. This allows your style to move naturally while staying in place. For maximum lift emphasis, try misting the hair from below; this ensures the product reaches the underside of your sections to support the volume from the foundation.

19. Switch your part

Something as simple as a part change can give flat hair an instant boost by challenging "root memory." When you part your hair the same way for a long time, the follicles become accustomed to falling in that specific direction. By switching your part, you force the roots to stand in a direction they aren't used to going, which creates a natural arch effect that lifts the hair at the base. To keep this effect effective, we recommend using this as an occasion-based hack rather than a daily switch, as the hair will eventually develop a new memory for the second position.

20. Add layers

For the longest-term solution on this list, consult your stylist about adding layers to your cut. Rather than just asking for layers broadly, discuss specific placement with your hairdresser to ensure the cut complements your hair density and face shape. A well-placed layered cut gives your mane the illusion of having more body and movement, which makes it look fuller and prevents the weight of your hair from pulling the roots flat.

Next Up: Hair Treatment for Thin Hair: How To Care for Fine Strands

Photo courtesy of L’Oréal Paris