Drug experts are warning people not to buy a tanning drug online.
Kevin, 27, says he's used Melanotan II for the last two years
Melanotan II is sold as an injection but it hasn't been licensed in the UK and so it is illegal to sell it in this country.
Newsbeat first reported this back in 2008 but more and more websites have been found to sell the drug which works by stimulating the melanin that occurs naturally in the body.
Melanin is a pigment that determines how dark your skin is. The more of it you have, the browner you are.
Kevin Gebbie is 27 and lives in Glasgow.
'Feeling confident'
He orders Melanotan II online and uses it once a week.
He said: "Some of my friends had done it before I started. I saw the colour they got and I just didn't think I suited being pale. Now that I am that bit darker I am more confident."
He admitted there had been issues with the drug.
"When I first started using Melanotan II there were certainly side effects," he said.
"I was nauseous and had sleepless nights. The only way I can describe the other side effect was like a growing pain in your leg where you just wanted to stretch all the time."
The long term side effects of the drug aren't known.
Kevin says he's not worried though: "It doesn't bother me at all, I just think there's greater worries in life than not knowing what's in it.
"It makes me look good and makes me feel good about myself as well."
Jim McVeigh is from the Centre of Public Health at Liverpool John Moores University.
He said: "It's important to emphasise that there's no way people can actually know what product they are buying.
'Many complaints'
"People are buying things on the internet and they don't know what's in it. They don't know what's in it on a number of different levels.
"They don't know if it actually contains Melanotan II, they don't know if there's any other substances in it, they don't know if it's contaminated."
Since 2008 the Medicines and Healthcare authority MHRA had 60 complaints about sales of Melanotan but there's no way of finding out how many people are buying it over the internet.
"We don't have formal figures to be able to call on, a lot of it is anecdotal," Jim said.
"One thing that we can do is see the amount of talk about it and the number of websites emerged selling the product. If there wasn't the market for it people wouldn't be investing selling it to people."
Harry Shapiro is from DrugScope and said one of the problems is that the websites can look legitimate: "Anyone can make a fancy looking website, and often you don't know where these sites are based.
"It could look like a UK site, but the drugs could be coming from China, could be coming from anywhere, you've got no come back, there's no good complaining if you get ill."
Harry said buying the drug from websites based abroad can be risky.
"It'll look like a genuine medicinal product but you don't know what's in it," he added.
"You know people who buy this kind of stuff are not medical experts, they don't really know, they're just going to take it on trust and that's where the danger lies."
