Table 4: Common active ingredients found in the top selling hair loss products in Amazon.com.

Active ingredient

Number of products (%)

Available formulations

Monthly coast

Minoxidil

14 (28%)

Topical

10.33-145.79

Botanicals

Tea tree

4 (8%)

Topical

5.98-28.75

Jojoba oil

8 (16%)

Topical

5.98-42.99

Argan oil

8 (16%)

Topical

5.98-37.99

Saw Palmetto

8 (16%)

Topical-Oral

9.88-88.00

Caffeine

4 (8%)

Topical

18.99-29.98

Nettle

3 (6%)

Topical-Oral

9.66-42.99

Coconut

8 (16%)

Topical

6.23-42.99

Castor oil

7 (14%)

Topical

13.75-25.99

Aloe

5 (10%)

Topical-Oral

9.48-28.75

Green tea

4 (8%)

Topical-oral

6.23-42.99

Rosemary

5 (10%)

Topical

6.23-42.99

Peppermint

3 (6%)

Topical

25.99-42.99

Grape

3 (6%)

Topical-Oral

10.99-42.99

Vitamins

Biotin

19 (38%)

Topical-Oral

5.98-88.00

Vitamin A

6 (12%)

Topical-Oral

8.15-88.00

Vitamin B

5 (10%)

Topical-Oral

15.00-39.97

Vitamin C

4 (8%)

Topical-Oral

21.99-39.97

Vitamin D

4 (8%)

Topical-Oral

8.15-88.00

Vitamin E

3 (6%)

Topical

15.00-28.75

Minerals

Zinc

7 (14%)

Topical-Oral

5.98-88.00

Calcium

3 (6%)

Topical-Oral

8.15-39.97

Amino acids and proteins

Keratin

10 (20%)

Topical-Oral

15.00-37.91

Collagen

2 (4%)

Oral

21.99-88.00

Amino acids

2 (4%)

Oral

39.97-88.00