Age, stress, diet, medication, genetics, hormonal changes (from pregnancy, perimenopause and menopause) plus harsh products and hairstyles can all cause hair thinning and shedding—it’s no wonder so many women share the experience of hair loss. After consulting with a board-certified dermatologist to rule out any serious underlying issues, investing in topical, over-the-counter formulas for hair loss can help turn things around. Luckily, this year’s Amazon Prime Big Deal Days (aka October Prime Day 2025) is full of hair growth-promoting shampoos, conditioners, serums and treatments that get to the root (pun intended) of the issue and promote touchable thickness and luscious volume fast. Read on for our picks of the best hair deals for thinning and aging hair to shop during the Amazon Prime Big Deal Days 2025.
Best Prime Day Deals for Thinning Hair
Gentle Shampoo Normal for Thinning Hair
California trichologist Mandy Buechner previously told NewBeauty the key ingredients in this gentle shampoo “work to unclog follicles, refresh the scalp and improve the appearance of fullness in just one week.”
GRO Hair Serum
A full dropper of this plant-based, lightweight serum on the scalp every day helps to stimulate hair follicles, boost density and reduce shedding.
4D Hair Growth Cycle Supplements
Viviscal 4D Hair Growth Cycle Supplement is a twice a day regimen that supports overall hair growth and promotes fullness, strength, shine and nourishment. With vitamin A, biotin, zinc and copper, the formula is proven in clinical studies to deliver “stronger hair in three months, less hair shedding in two months and improved hair appearance in the very impressive timeframe of only one month.”
Root Purifier Scalp Microbiome Shampoo
Dermatologist-recommended brand Nutrafol is prominently featured in Prime Day this fall. If you’re not ready to jump into supplements, start here: the Root Purifier Scalp Microbiome Shampoo clarifies and strengthens the scalp without stripping it, creating the ideal base for healthy growth.
Cold Precessed Stem Cell Shampoo
Apple stem cells power this anti-shedding shampoo to “boost cellular production” and “stimulate the scalp and elongate the hair follicle growth phase,” our editor previously reported.
The Scalp Serum
“The star ingredient in this fragrance-free serum is five percent Capixyl, which is a patented complex comprising a biomimetic peptide and red clover flower extract. They work together to encourage hair growth and keep existing hair anchored to the scalp,” explains our editor. The Scalp Serum is also recognized by the National Eczema Association for its gentle and skin-friendly formula.
2% Minoxidil Topical Solution Hair Regrowth Treatment
When you think of hair loss treatments, Rogaine may be the first brand to come to mind—it was the first FDA-approved formula for hair growth for men and women. The main ingredient, Minoxidil, is typically acquired through a prescription, but Rogaine’s 2% solution is the strongest available OTC.
Destined for Destiny Caffeine + Biotin Peptide Density Shampoo
This hydrating shampoo contains caffeine, ginseng root, aloe vera leaf juice, zinc and biotin to encourage scalp circulation, creating the ideal environment for hair growth.
