Melanotan 2 just increases melanin in your body,you become tanned whether you tan or not, increases libido and can help in fat loss. Ive never heard of people having their lips turn purple in particular but you need to realize that if you take too much constantly your results can be dramatic and you will look like a different race. But the effects only last a few months after you stop taking it. You do a loading dose til your at the colour you want , then you cut it down to maintain colour. I know there are some people doing logs on melanotan 2 in some of the sponsors sections with their results . Hope this helps you a bit. some sides are that it darkens freckles,moles ect and some people get what looks like sun spots.