Lookalike sites copy a brand name with one small change and rely on you not reading the address.
A swapped or doubled letter, an extra hyphen, a different ending, or an ad that uses the product name. Prices may be too good, and payment methods unusual.
Reach the checkout from a link you trust, check the pack prices against the 2, 3 and 6 bottle tiers, and walk away from any page asking for payment in unusual ways.