Olli,
I planted heirloom non-GMO varieties from SeedsNow.com. The peppers were a bell variety and the carrots were an old French variety called Nantes. Both produced very large vegetables and I swear every carrot seed I planted around the pepper plants grew and grew very well. That said, I have been gardening for sixty years, so I should know what I'm doing by now. ;-) This year I have chosen a great number of other varieties to grow, as variety is the spice of life and one never knows when one may fall in love with something new. :-)
Just remember, a seed's only job in life is to grow. You just have to provide the right conditions. :-)
Dragonkist