It's electrostatics, not nutrition. Your hair carries a slight negative charge, and damage from bleach, dye, sun, and heat raises it sharply. The active ingredient is a positively charged surfactant, a quat, that binds to the negative sites and deposits film where the fiber is most damaged. That's why it lands on the ends and skips the roots without you steering it ¹. Bleached hair carries roughly five times the surface charge of virgin hair, so it grips more film ².

The bench evidence is solid. Conditioner cuts the force needed to comb wet hair by 30 to 80 percent, with the biggest drop on bleached fibers ³⁴. Less pulling force means fewer broken cuticle scales and fewer split ends. Nobody has tested whether ten years of use grows measurably longer hair; the cause-and-effect chain holds, but the multi-year study doesn't exist ⁵.

Pay for the formulation match, skip the brand. Fine or oily hair wants the lightest rinse-out, ends only. Curly and coily hair wants the heaviest, because scalp oil can't reach the ends of a curved shaft ⁶. If you bleach, dye, or heat-style, you've exposed more binding sites, so a rich formula does more and skipping it shows faster ². A $5 drugstore bottle and a $60 salon bottle test the same on the ratings that matter; typical spend runs $30 to $60 a year ¹.

The detangling pass is the whole point. Wet hair, conditioner still on, wide-tooth comb, ends first. That one move is most of the long-term benefit; a dry fine-tooth comb an hour later is where the breakage comes back ⁶.

Fast then slow. First wash: a comb that doesn't yank, hair that dries softer. Within a month, fewer broken strands on the pillow. Then the quiet part: over months to years the breakage rate at the ends drops below the growth rate, so hair stops stalling at one length and starts to accumulate ³⁶. None of it is transformative. It's slow and cumulative, two minutes a wash and under sixty dollars a year.