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Written by Karine Sevigny
1 January 2026
A wider part or a more visible scalp can be signs that your hair is losing density. Learn how to recognize these changes, what affects hair thickness, and how to increase hair density based on the cause.
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In this article
Hair thickness, or hair density, refers to the number of hairs growing in a given area of your scalp, while hair thickness describes the diameter of individual strands. When density decreases, your hair may look less full, and your scalp may become more visible. You might also notice more shedding than usual or a part that appears wider and more defined.
These changes can have several causes, including hormonal changes and nutritional deficiencies, such as insufficient protein or certain vitamins. If you’ve noticed thinning or increased shedding, a healthcare professional can help identify the cause and discuss how to increase hair density based on your situation. They can also determine whether a deficiency is present and recommend vitamins or supplements, if needed, to support healthy growth.
If you’re looking into how to increase hair density, be wary of online promises of results in just a few days. Supporting new growth takes time, and the right approach depends on what’s causing the thinning. A targeted care routine and healthy habits can help support your hair, while styling products can temporarily improve the appearance of hair thickness.
Here are three brands with ranges designed for thinning hair and hair density loss:
The Nioxin products are known for their effectiveness in slowing down or stopping hair loss. They are equally effective in replenishing thinning scalps and restoring hair thickness. Additionally, their systems (shampoo and conditioner sets) are available in several versions. The formulas vary to suit both natural and colored or chemically treated hair.
Price
$37.90 / 70ml
Why we love it?
Clinically proven to increase hair density in 3 months, this night treatment for hair thickness helps fight hair loss, including curly hair loss. It leaves a very pleasant, refreshing effect on the scalp.
Serioxyl Advanced is one of the most popular ranges at L’Oréal Professionnel! Thanks to its formulas enriched with Magnesium and Polysorbate 21, these hair thickness treatments cleanse the scalp of impurities, excess sebum, and unwanted residues, creating a better environment for the growth of new hair.
Price
$59.90 / 90ml
Why we love it?
Thanks to a combination of two key ingredients, Stemoxydine (patented molecule) and Rexveratrol (powerful antioxidant), this serum awakens hair follicles to activate the growth of new hair, thereby increasing the overall hair density. In 6 weeks, it effectively increases hair density. In 3 months, it provides visibly fuller hair.
Actiiv products use cold-pressed ingredients that are carefully extracted to preserve all vitamins, minerals, and antioxidants. This method ensures that nutrients are delivered effectively to the hair and scalp, promoting strength, vitality, and overall hair health.
Contrary to what some may think, Actiiv Hair Science products do not need to be used daily to be effective. What matters most is consistent, long-term use rather than daily application frequency.
Price
$67.50 / 215ml
Why we love it?
Actiiv Hair Science uses plant-based ingredients to effectively and naturally combat hair loss, helping to visibly improve hair density within 90 days, depending on the severity of the hair loss.
It is used every other day in place of your regular shampoo and conditioner and takes only 5 minutes to work.
The product line offers a formula specifically designed for women, Recover Women, as well as an equally effective shampoo tailored to men’s hair loss concerns, Recover Men.
That's not all! We have many more products to increase hair density!
See all products*Prices and availability of products are subject to change without notice.
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