Assalam O Alaikum & Masha'Allah for good results with Frankincense.
Lubaan as a medicine for forgetfulness was quoted by Sahabah-e-Rasool (and probably not by Prrophet Muhammad Sallallaho Alaihe Wasallam).
And the oceans of knowledge who have recommended Frankincense were Ali Bin Abi Talib Radi Allaho Anh, Abdullah Bin Abbas Radi Allaho Anh & Anas Bin Malik Radi Allaho Anh.
See the reference from Hafiz Abu Nuaim's book on Tibb-e-Nabawi.
Apart from frankincense, below are the medicines further for Nisyaan :
· Taking Hijamh on the head
· Reading & watching the Huroof of Quran
· Protecting your eyes from watching the unlawful
· Honey ~ best for children
· Taking almonds & Zabeeb (dried grapes / kishmish/raisins) together ~ best for children