The efficacy of a shampoo brand depends on its active ingredients. For moisturizing lines, look for Argan oil, Shea butter, or Hyaluronic acid. For strengthening and repair, prioritize formulas containing Keratin, Biotin, or Silk proteins. If targeting the eco-conscious segment, ensure the surfactants are Sulfate-free (e.g., Sodium Lauroyl Sarcosinate instead of SLS/SLES). For anti-dandruff products, the presence of Zinc Pyrithione or Ketoconazole is essential, but these may classify the product as an Over-the-Counter (OTC) drug in some jurisdictions, requiring stricter licensing.