First of all you need to start with a small dose like with a pinch of her for assessing tolerance of your body and then you can take it within appropriate amount.
• If you are a pregnant women or if you are breastfeeding or you have any skin allergy then you should not use it without proper consultation of a doctor.
• You should not take it more than one teaspoon in one day and you should always combine it any other spice or her to minimise it's side effect.
• You should choose purely organic ajwain seeds or grounded form of ajwain for use because if there are any other spices mixed or any other herbs present in it then it may be problematic for you because you don't know that which thing is included in it which you are taking.

Have a look at these points please @afzalqamar
All these are detailed ways to avoid these potential side effects of ajwain!I have added already!

Thank you for your review!
It means a lot 💕