A typical 1 medium serving of nectarine contains 1.5 grams of protein (1.06 g per 100 g), which makes it only a minor source of protein. That covers roughly 3% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 10% of the calories in nectarine come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
Among the 71 fruits in the database, nectarine ranks 21st by protein per serving, and 691st out of all 796 foods on the site. Set against avocado, another fruit entry in the database, a serving carries about 0.5 g less protein (avocado has 2 g per 1/2 fruit).
It is an incomplete protein on its own; pairing it with other plant foods across the day covers the full range of essential amino acids. The serving above is counted by piece at 142 g. Because pieces vary, the per-100 g figure is the one to use when comparing this against a food measured a different way.
Source: USDA FoodData Central #169914 - "Nectarines, raw" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Nectarine protein FAQ
How much protein is in nectarine per 100 g?
Nectarine has 1.06 g of protein per 100 g. A typical 1 medium serving (142 g) provides 1.5 g.
Is nectarine a complete protein?
No. Nectarine is an incomplete protein on its own; pairing it with other protein sources across the day covers the full range of essential amino acids.
How much of the Daily Value does a serving of nectarine cover?
A 1 medium serving of nectarine contains 1.5 g of protein, about 3% of the 50 g reference Daily Value.
Is nectarine a good source of protein?
Nectarine is only a minor source of protein, and about 10% of its calories come from protein, which makes it more of an energy food than a protein food. Set against avocado, another fruit entry in the database, a serving carries about 0.5 g less protein (avocado has 2 g per 1/2 fruit).