With the increasing advent of various kinds of diseases, the use of steroids has also been in demand these days. L-Thyroxine is an artificially produced thyroid hormone that is often used by patients suffering from thyroid problems. This steroid has got a similar effect to that of the naturally produced L-T4 produced in the thyroid gland. This steroid is also used by athletes and body builders who are benefitted by this product as it helps in burning fat in spite of calorie intake. However, severe side effects like headache, insomnia, leg cramps, weight loss, fever etc may persist on taking this steroid.