All NIOXN system kits are designed to provide thicker fuller hair and an optimal scalp environment, as foundation for healthy hair. However, each of them is designed for specific scalp conditions. Scalp Relief is for sensitive, dry and itchy scalps, designed with a gentle formula which improves scalp conditions and take care of the hair at the same time. Scalp recovery is for dandruff as it fights the fungus called Malassezia causing the issue. All the other System kits provide a regimen for those people who do not suffer from any of the above-mentioned scalp conditions but are looking for a complete regimen to keep the scalp clean, purified and get thicker fuller hair.