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Does exactly what it says on the packaging: thicken. Derma Activate Thickening Spray is a body-building leave-in spray for fine or thinning hair. Infused with Vitamin H, which improves the quality of the keratin inside your hair ‚stronger keratin means stronger hair that‚ less likely to fall out. Provitamin B5 is a powerful moisturizing and thickening agent that‚ strengthen the hair structure over time.