How can you make a Dev Product give health when you buy it?

Well I need a script that will allow robloxians to get health when they buy a dev product. I want it to stack so they can buy it multiple times and it will add. Please reply it will help me a lot!!

I had already made a system like this, This website isn't a requesting place though

If you attempt to make this I will help you

The Roblox Wiki has has an example of this exact situation.

http://wiki.roblox.com/index.php?title=Developer_product

Here is a sample place that is open source and contains a Dev product that restrores health. http://www.roblox.com/Developer-Product-Sample-place?id=147965737

I hope I helped!