No, do not add your own serum or oils into the serum strips for
use.
The serum strip is intended for one styling session only. Please
dispose of the used serum strips after one styling session.
Philips’ nourishing serum is made specially for these strips to be
used with this straightener (BHS522, BHS503, BHS526, BHS507)
and no other.
Do not use the serum strips on any other straighteners.
Do not use other serum or oil with this straightener.