This heat pretector is something I always repurchase. It protects my hair and makes it smell super good!
Heat Protector Spray | Protect Hair From Heat Damage
This deep purple mask from L'Oréal is a must if you have blonde hair. It is super affordable (like $7 at shoppers when it's on sale) and lasts for many applications. It is super powerful so it can be used quite sparingly. The results are too good.
Color Radiance Deep Purple Mask | L'Oréal Paris
This stuff made my hair grow super fast and is easy to apply. The biotin also made my split ends repair quite a bit.