Yes, you can use the treatment with hair extensions. It’s a suspension in an aqueous vehicle, meaning it's mostly water-based, with the active ingredients suspended in the liquid. It will feel lighter than oil-based products but may leave a slight residue if not shaken well before use.
To avoid contact with bonds, glue, or microlinks, apply the treatment directly to your scalp, parting your hair as needed. Keep in mind that some extensions can cause hair loss due to tension on your natural hair, so constantly wearing extensions may affect your results.
While the formula is scalp-friendly, if you have concerns or notice any issues with your extensions, it’s best to consult your hairstylist.