What the recommended sodium intake per day?

The American Heart Association recommends that for every 1,000 Calories of food consumed, the sodium intake should be 1,000 mg and should not exceed the 3,000 mg limit.

Note that most of this sodium doesn't come from adding salt to food, but rather from the sodium levels in highly processed foods we eat. There may be more sodium in less salty-tasting food; ex., high sodium salad dressings versus salty french fries.
Human's daily sodium intake should be around 2,400 milligrams. However, this recommendation may vary depending on a person's size, and medical conditions.