I read online that pheromones can mess up your body an I was just wondering if it is true. Also what happens when you od
Only if you hit someone with the bottle!
You produce your own pheromones naturally. So unless you are allergic to yourself than the answer would be no 
.
When you OD you send a signal that what you are wearing does not naturally happen in nature, therefore in most instances it is ignored (Ghost effect). What could also happen is described as -None aggression. Androstenone is an aggressive molecule (essentially the hormone testosterone that the body doesn’t use and escapes as sweat converting to pheromone androstenone). It can make those around you, or you moody and agitated. Adjusted persons are able to control their emotions and while moody you still wouldn’t go out and start a fight. You might find that others aren’t well adjusted and might take issue with you.
Other than that nothing is really going to occur
Please.. god.. not.. this.. again..! 
Camz - These threads have a habit of going right off the rails. Bringing-out the nutters and ending in flamings, bannings and the like!
Pretty-much, short of drinking them or self-abuse with the bottle, there is no measurable risk at all from mones.
There are anecdotal negative reactions which are often attributable to issues with the wearer and or negs from individuals themselves but this can be expected as there are a lot of factors that influence phero response, good and bad.
OD is not like the drug sense - At worst you can feel a bit rough, burned out tired (IS and nols) and certain pheros like none can trigger confrontation/agression or simply repel people if you wear too much. This is why you need to test for your sweet spot. Mostly, you will simply get ignored. Don’t worry about ODing - its a sign you have found your upper limits for any given situation and all part of the learning experience. Don’t do as I did and go to the roughest pub in town on your first time out with IJ - Interesting!
There are a couple of pheros that do have recorded medical effects - Meo EST has health concerns and A1 can trigger short-term mildly depressive symptoms in a small amount of guys. Neither are currently sold by AD and there are a lot of past threads discussing them.
No they cant hurt you when used properly any more then your natural ones can hurt you. Where in the world did you read that ?
Dont spray them in your eye’s or on sensitive skin.
Dont drink them
Dont use the whole bottle (more is not better)
Dont inject them
Dont throw the bottle at anyone as Steve mentioned.
As Mobcaster mentioned the term OD which scares many people just mean opposite of desired effect. Its not a clinical OD.
Pheromones do not signal inside the body like hormones do. Inside the body they can cause changes to the physiology. They simply connect with various sensors in the olfactory system causing your neurotransmitters to fire evoking feeling and emotion.
You have been communicating pheromonally since your birth. You learned it and bonded with your parent this way when you were a baby. Your emotions evoke a pheromonal response all the time. Synthetic mones just give you more control over what you are communicating.
Tisha
Are you sure you weren’t reading about hormones?
Tinkering with those could mess up your body.
LOL! That was close. I was almost beginning to worry. 
Hahaha…
Yeah. I don’t think they can… although I have noticed an almost alergic reaction like a bit of a stuffy nose before with some of them. But it might have just been alergies. Who knows. Either way, I am still alive so I’m not too terribly worried. But yes… as far as I know you should be more than safe. They are produced naturally. This is true. 