Can a nursing mother take supper appeti to increase her appetite? It contains cyproheptadine
Just check it up Super Appetite is actually CYPROHEPTADINE

It is not a multivitamins. It is a drug meant to treat allergies but has side-effect of increasing appetite people use it for that purpose but that is not the primary reason for the medication. It has other side-effects too, please do not use without a doctor's prescription.
Most Paediatricians will not recommend it. I personally do not sanction its use for boosting appetite in children because of the other side effects