His Royal Highness met with Andrew Bates, a young man who was diagnosed with HIV in 2015, who shared his story and talked about the importance of testing.
Prince Harry also met Yvette Twagiramariya, reporter and one of the faces of the It Starts With Me campaign, who took a live HIV test to show Prince Harry how the self tests work.
Before departing the shop, the Prince met and talked with some local Hackney residents, and gave each of them one of the self test kits to take home.
The visit coincides with new figures from Public Health England on HIV that show the drive to increase HIV testing is having an impact, with a 21.8 per cent drop in the number of people who are undiagnosed and do not know that they’re living with HIV.
However, there are still 10,700 people in England who are unaware that they’re living with HIV.
In addition to this, late diagnoses is decreasing at a slow rate, with 2,170 people living with HIV being diagnosed late in 2016.
You can find out more about National HIV Testing Week, which runs from Saturday 18 to Friday 24 November, by visiting the Starts With Me website.
Public Health England: 'Towards elimination of HIV transmission, AIDS and HIV-related deaths in the UK: 2017 report'
Public Health England: 'HIV testing in England: 2017 report.