1. Natural Steroids:-These ones are not of much harm. Natural steroids are ones which increase our functioning of hormones in a faster manner. They are being generated naturally through exercises and certain foods. In other words, we find ourselves very difficult to perform exercises while we are in beginner stage. But, later on while our body starts responding to exercises, we find it easier to do exercises and then we try to move on to next level of exercises.
The reason for this is that while we increase our performance in exercises, prohormones are generated. Prohormones are the substances in body which induce the amount of hormones such as cholesterol, estrogen, testosterone. Due to increase in amount of hormones, the performance of body increases gradually. We find ourselves more energetic than previous. These things doesn't come under natural steroids, rather it happens due to lot of practise in exercises. Coming to natural steroids, there are certain foods which perform the same type of fuctions. Certain hormones are already available in certain natural products. So people who are consuming that doesn't need to convert them so as to get the hormones. These ones are consumed directly. Milk is an example. Milk contains progesterone hormone which are taken directly. Consuming more milk everyday increases the size of body.
Many discussions had been going around the world concerned with the side effects of natural steroids, but nothing much had been proved much about it. Of course, we whatever taken in excess has its own side effects. Not only that, the reaction due to natural steroids may differ from person to person, due to his habits, physique, any surrounding disease like diabetics and many other underlying factors. These are the substances which are taken by athletes nowadays to increase their performance.