Great questions @phinaloly! I have read that some people use sea salt instead. Some people do a mix of epsom and sea salt because they have slightly different properties.

You can use any baking soda you want as long as it is sodium bicarbonate. The arm and hammer brand I have pictured is pretty inexpensive.

Honestly, the effects and benefits will be different for each person. I can feel a difference after one bath, and I try to take one everyday when I feel sick.

I am not aware of any negative side effects - but know that it will make you sweat and cause your body to heat up.

If someone is pregnant, I would recommend they ask their doctor first. I am not a medical professional and am not in a place to be giving advice to someone who is pregnant.

I hope that helps!! Let me know if you have any other questions.