Ingredient names can help you narrow your search, but they are only a starting point. When you compare onion and biotin products, make sure you also compare the amount supplied, the product format, and the steps involved.
Check what the listing actually provides
Onion & Biotin Shampoo is listed as a 200 ml rinse-off shampoo. The supplier's selected ingredient information names onion bulb extract, biotin, and rosemary flower extract. Use that information to identify the product, then read the package for its full ingredient list.
The presence of biotin or a plant extract does not establish that a shampoo will regrow hair. Keep your expectations tied to the product's described cleansing routine rather than an ingredient trend.
Compare a single cleanser with a set
A shampoo bottle and a shampoo-plus-treatment duo are different purchases. Onion, Biotin & Rosemary Wash Duo includes a separate treatment step in its listed method. Choose the format you intend to use rather than assuming similarly named products contain the same items.
Read the directions before wash day
For the 200 ml Onion & Biotin Shampoo, the listed steps are to wet the hair and scalp, lather an appropriate amount, gently massage, and rinse thoroughly. There is no reason to copy a development time from a hair dye or leave it in like a styling spray.
Keep your order simple: confirm the exact product, amount, package, and method. Browse Shampoo & care for the full range, or read how the treatment step works in a wash duo.