Is it safe to use with coloured or chemically treated hair?

Coloured, bleached, permed, or relaxed hair tends to be more porous and loses moisture faster, which is exactly what the emollients in this serum (avocado oil, shea butter, castor oil) address. They fill gaps in the cuticle, reduce friction, and slow down colour fade caused by UV and washing. Apply 2–3 drops to damp, towel-dried lengths after every wash to maintain elasticity and shine. The rosemary and cedarwood oils are present at cosmetic levels and are not known to strip colour; however, essential oils can be sensitising on a freshly processed scalp.

Wait at least 48–72 hours after a colour, bleach, or chemical straightening service before using the serum on the scalp. During that window the cuticle is still resealing and the scalp barrier may be compromised, increasing irritation risk. On the lengths you can apply a tiny amount (1–2 drops) sooner if the ends feel straw-like — just avoid the root area. If you use a prescription scalp treatment (e.g., topical minoxidil), apply the medication first, let it dry completely, then follow with this serum on the lengths only to avoid diluting the drug. Store the bottle away from direct sunlight and heat; essential oils oxidise faster when exposed, which can increase sensitisation potential over time.