While Oil of Oregano has many benefits, there are a few possible side effects:

It may reduce the body’s ability to absorb iron. Therefore, it is recommended that any regular use be combined with regular consumption of iron supplements. For this reason, women are advised not to use Oregano oil during their pregnancy. For pregnant women it can also stimulate blood flow in the uterus, which can weaken the lining that surrounds the fetus in the womb.

People that have allergies to thyme, basil, mint, or sage may be sensitive to the oil as well, since they are in the same family of plants. If any skin irritation, rashes, or vomiting occurs when using it, it is recommended that you discontinue use and consult your doctor.

Avoid toxicity from high levels of thymol by only purchasing oil made from Origanum vulgare, and use the smallest recommended dose to start, working your way up gradually to larger doses. Some people are more sensitive than others, so it’s best to start small and work up from there.

Die off symptoms include dizziness, nausea, headache, extreme fatigue – this can be caused by the liver releasing dead pathogens. Help minimize these unpleasant symptoms by drinking plenty of water along with your recommended dose of Oregano Oil.

When applying the oil to the skin you might get a burning sensation. To avoid this burning sensation, especially when applying Oil of Oregano to sensitive areas, always dilute it well with olive oil or coconut oil.

And of course, do your own research on the subject. Make sure you are well informed before using any kind of supplement.