The healthiest substitutes to season food without excess salt comes from fresh herbs, garlic, onion, and vinegar. Fresh herbs are healthy because they are fresh and untouched by preservatives and other additives. Fresh garlic is also a wonderful and healthy alternative that is widely popular as a seasoning for savory flavor already. Onion and vinegar can add great flavors. All in all, if you are looking for a standout healthiest alternative, garlic would be the number one. Garlic has many health benefits, such as lowering blood pressure, lowering cholesterol, and has powerful antioxidants. It is an all-around great addition to your meals.