Nitrates from plants typically form nitrite instead of nitrosamines, due to the presence of vitamin C.

“Nitrates, which people like to often use as the counter, well they're in plants. And they also can form nitrosamines, which is true, but nitrates, which are everywhere in nature...They're in all plants and they're all over the place. They tend to form nitric oxide and not nitrosamines. And the reason for that is because plants also are packaged with a whole other bunch of nutrients and micronutrients. In the plant, it was designed a certain way. And so the high vitamin C content which are in all green leafy plants, all plants fruits, vegetables, they all have vitamin C. The vitamin C present there shifts the pathway, the nitric oxide. And so it tends to not form nitrosamines. And that's why eating plants, you end up getting more nitric oxide when you eat them, which is good because it's good for vasodilation. It helps endurance, right? You're getting more red blood cells, more oxygen.”