When sourcing rebonding kits, you must verify the concentration of Ammonium Thioglycolate (ATG), which is the primary reducing agent. For sensitive or damaged hair, look for Cysteamine-based formulas as they are gentler. Additionally, ensure the presence of conditioning agents like Keratin, Argan Oil, or Collagen to mitigate structural damage during the chemical process. Always request a Material Safety Data Sheet (MSDS) to confirm the pH levels, which should typically range between 9.0 and 9.5 for the relaxer.