10 Best Shampoo For Thin Hair 2025 in the United States

The Nioxin Scalp + Hair Thickening System 2 Shampoo is a solid choice for those with natural or untreated thin hair experiencing noticeable thinning. It focuses on thickening and adding fullness, with many users reporting visible improvements in hair density and volume within about a month. The shampoo supports scalp health by gently cleansing away impurities and excess oils that can block hair follicles, which is important for maintaining a healthy environment for hair growth.

It contains ingredients like niacinamide and biotin that help strengthen hair and reduce breakage, promoting the look of thicker hair over time. The inclusion of botanicals and antioxidants also helps nourish and protect the scalp, which is a plus for overall scalp condition.

If you want a shampoo designed specifically to boost volume and support scalp health while reducing thinning, this one could work well. Users with very sensitive scalps may want to consider additional factors when choosing a product.

The Aveda Invati Ultra Advanced Exfoliating Shampoo Light is tailored for people with fine to medium thinning hair and normal to oily scalps. It stands out for its exfoliating action, using wintergreen-derived salicylic acid to gently remove excess oil and buildup that can weigh hair down or clog pores. This helps maintain a cleaner, healthier scalp, which is crucial for thin hair. Being 95% naturally derived and free from harsh sulfates, it’s a gentle option that won’t strip hair, supporting scalp health while cleansing. The lightweight cream formula avoids heaviness, which is beneficial since thick or oily shampoos can make thin hair look flat. Aveda’s focus on reducing hair loss is backed by their claim of a 77% reduction when used as part of their full 4-step Invati system, which may appeal to users looking for stronger hair retention. The shampoo is pH balanced and protein-enriched, helping to strengthen strands and add body without causing buildup.

This product is best suited for those with normal to oily scalps and may not be ideal for dry scalps. Also, to achieve the full benefits, the shampoo needs to be used alongside other Invati system products, which is something to consider for cost and routine complexity. The lavender scent is mild and pleasant but subjective to personal preference. The shampoo offers a thoughtful blend of natural ingredients and scalp care features designed to support volume and reduce hair loss in thinning hair, especially for those with oilier scalps.

Living Proof Full Shampoo is designed to add noticeable volume and bounce, making hair appear thicker and fuller, which is ideal for people with thin hair. It uses a sulfate-free formula that gently cleanses without stripping natural oils, helping maintain scalp health and protecting color-treated hair.

Its lightweight feel keeps hair soft and manageable without weighing it down, and it is free from parabens, silicones, and other harsh chemicals, which is great for sensitive scalps. The shampoo also offers a fresh, pleasant scent that many users find uplifting.

This shampoo suits those looking for a clean, effective volume boost without harsh ingredients, especially if they have color-treated or delicate hair. Some users with very fine or oily hair might find that it works best when used alongside other styling products.