How should I apply it for the best effect on fragile, long or fine hair?

After shampooing, squeeze excess water from the hair so the product isn’t diluted. Dispense a walnut-to-golf-ball amount (depending on length and density) into your palm, emulsify, and distribute from mid-lengths to ends — the oldest, most fragile zones. For fine hair that loses body, keep the product off the root area to avoid weighing it down. Leave it on for 2–3 minutes; for very brittle or long hair you can extend to 5–10 minutes as an intensive mask once a week. While the conditioner is in, gently detangle with a wide-tooth comb or your fingers starting at the tips and working upward — this is when the slip from Trichogen® and the lupin extract most reduces breakage. Rinse thoroughly with lukewarm water until the hair feels clean but not squeaky. Use every wash or 2–3 times a week; daily use is safe because the formula is free from heavy mineral oils and parabens.