If honey is pure from a reliable source, it has no side effects at all, except for those suffering from Liver disorders (including Diabetes) and they should take it with vinegar (Sakanjabeen) to neutralize its harm.
Ibn Al Qayyam wrote that honey preserves the fruits, and there is no danger if fruits are taken with it, in fact, eating Bananas with honey is the best combination to reduce the side effects of Bananas (they aggravate bile & phlegm). We have observed that if 3~4 Bananas are taken with honey as a breakfast, Uric acid reduces.
You can read the words of Ibn Al Qayyim (Rahimahullah) “Honey will keep some types of fruit fresh for six months. It preserves dead corpses, thus deserving to be called, “The true preserver”.
When honey is applied to someone that is infected with lice, it will kill both the lice and the eggs. Honey will add softness and beauty to the hair while allowing it to grow longer.
When honey is applied to the eye as Kohl (eyeliner), it will strengthen weak eyesight. Honey whitens the teeth, preserves their health and the health of the gums, opens the orifice of the veins along with causing the flow of menstruation. Furthermore, licking honey on an empty stomach will help the body get rid of mucus and phlegm. It cleanses the stomach and rids it of harmful substances or mixtures, heats the stomach mildly and opens up the pores.
Honey has similar effects on the kidneys, the prostate, urinary bladder and the liver. Furthermore, honey is the least harmful sweet substance for congesting the liver and kidneys. Adding to all these benefits that we mentioned, honey does not have any side effects, nor harm except for those suffering from bile and who should take it with vinegar to neutralize its harm.