HAIR CARE 45
How solid bars are redefining personal care
Deborah McDonough, David Raymond – Bradford Labs
Solid shampoo and conditioner bars have rapidly moved from niche shelves to mainstream beauty conversations. While still an early-stage health and beauty category, representing roughly 2% of the current shampoo and conditioner market, the growth trajectory of solid hair care reflects a fundamental shift in how consumers are thinking about their personal care.1 Increasingly, these compact, waterless bars are
viewed not just as eco-friendly alternatives, but rather as premium, high-performance products capable of replacing their liquid counterparts. Early adoption of solid shampoo and
conditioner offerings can be tied to more artisanal offerings, traditionally crafted by independent makers at home or small-batch formulators, but more recently, larger brands have been looking to enter the market, as a way to extend their product lines, attract new, younger consumers, and offer different textures and formats. From an R&D perspective, solid hair care is an
especially attractive market because the products require less testing due to their low water content. On the sustainability side, the formulations are also more concentrated, meaning that brands can pack a lot more efficacy into a single small bar (compared to liquid-based formats) because they are not predominantly water. With this transition to new market opportunities
come new regulatory compliance measures, an elevated desire for a consistent product look and performance to align with brand reputation, sustainable material sourcing, and a growing need to scale production to meet demand. As a result, today’s solid hair care bars already look very different from the DIY versions that first hit the market only a few short years ago. To date, elevated momentum for solid bars has also been supported by a strong market opportunity. As consumers place greater value on sustainability, high-performing natural products, and cost savings, Grand View Research projects the global shampoo bar market size to reach $24.59 billion by 2030.2
Debunking historical myths about solid hair care As solid bars gain in popularity, misconceptions related to performance from their earliest iterations continue to linger. Yet today’s bars have little in common with versions of the past, which are often negatively perceived for being harsher on hair. Common myths include:
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“Solid shampoo bars don’t lather” Most modern shampoo bars contain the same kind of cleansing ingredients (surfactants) used in liquid shampoos, just in a concentrated solid form. In fact, many users are surprised that a well-formulated shampoo bar can lather as much as, or even more than, some liquid shampoos because the bar contains less water and a higher concentration of active ingredients, leading to a rich, creamy foam.3
“Solid hair care is not effective for thick, curly hair” Today’s solid bars are available in a wide range of formulations that use ingredients intended to effectively address the moisturizing, detangling, and curl-supportive needs of thick or curly hair. These modern solid hair-care products can be formulated with many of the same beneficial ingredients found in liquid products, including shea butter, cocoa butter, and argan oil. Furthermore, because bars contain little or no
water, they can deliver a high concentration of these conditioning ingredients, leading to long- lasting moisture.
“Solid bars will actually damage textured hair” When it comes to the effectiveness of hair products, the formulation and cleansing ingredients used, not the type of product, will have the greatest impact on hair health
and condition. A well-formulated shampoo or conditioner bar can be just as gentle and nourishing as a liquid product, depending on factors such as the formula’s pH, the conditioning agents used, and how well the product matches the user’s hair needs. As market demand grows, so does the diversity
of solid shampoo and conditioner bars, with new products formulated with milder surfactants and nourishing butters, now being developed specifically to address textured hair requirements.
“Solid bars leave residue” Yes, early soap-based bars did leave behind deposits in hair and on the scalp, but current surfactant-based bars rinse clean, and can rival the performance of salon-grade liquids. As a result, solid hair bars do not typically leave residue; rather, it is the formulation, water quality, and rinsing habits that typically determine whether buildup occurs.
“Consumers may face a transition period between liquid and solid product use, which could negatively impact hair health” Unlike natural deodorants, where the skin microbiome might need to adjust, the solid shampoo bar will work right away; it is more a matter of getting used to using a solid format. This includes ensuring the bar drains well and is not left sitting in water, as this could affect the bar’s
September 2026 PERSONAL CARE MAGAZINE
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