Instagram does not allow you to add links to your posts.
So, the only way to get your followers to click through to a product is via the profile link. The statistics we are getting show that brands who use their profile link to direct their Instagram followers to a "sandwich page" enjoy much higher sales conversion rates ranging between 3% to 8%. Those who direct their profile link to their home page or, a page not representative of their Instagram feed (as the source of the traffic) are much *less* successful with sales conversion rates ranging in the 0.5% - 1.2%.
If you haven't already come across embeds, here's a step by step video that shows you how to use them:
Note: Video does not contain audio.