What's the Best Active for Hair Growth?

Looking for an effective way to boost hair growth? Here's what you need to know.

Hair growth depends on many factors — genetics, lifestyle, stress — but above all on the care given to the scalp and the hair fiber itself. If you're wondering which ingredients actually work, the two most respected actives for restarting growth and reinforcing roots are castor oil and keratin.

1. Castor oil: the natural essential

Why it works

Castor oil is rich in essential fatty acids and vitamin E. It boosts microcirculation in the scalp, deeply nourishes the bulb, and supports the growth of stronger, thicker hair.

Use it if: your hair is dry, brittle, or you've noticed seasonal shedding.

How to apply: massage a few drops into the scalp, or use it as part of a shampoo or mask routine.

Discover the Castor & Keratin Complete Routine: shampoo, mask, serum, B.otox treatment, and heat protectant. A 5-in-1 cure to activate growth and repair damaged hair.

2. Keratin: the structural protein

Why it works

Keratin is the principal protein of your hair — when the fiber is damaged, depleted of keratin, it loses density and strength. Reintroducing hydrolyzed keratin in your daily care fills the porous zones, stops breakage at the source, and builds back density.

Use it if: your hair is brittle, losing density, or recovering from a shedding episode.

How to apply: a complete keratin-based routine, used consistently, gives visible results from the third week.

Try the Castor & Keratin Trio for the foundational routine — shampoo, mask, serum — built around hydrolyzed keratin.

Castor or keratin: which to choose?

You don't really have to choose. The two actives are complementary. Castor stimulates growth directly at the root; keratin reinforces the structure of the fiber and prevents breakage that masquerades as hair loss. That's why every Rosebaie gamme combines them.

• Hair shedding: Castor & Keratin (focus on growth).
• Dry, brittle hair: Coconut & Keratin (focus on nutrition).
• Visible results in 2 to 3 months: the complete cure, used consistently.

In summary

The best active for hair growth depends on your needs, but castor and keratin are the two most powerful options validated by both research and use. Start your hair cure with the Rosebaie ranges — 100% sulfate-free, paraben-free, cruelty-free.

Begin with the Castor & Keratin Complete Routine, or take the Hair Quiz to find the right protocol for your hair.