Onion
What it is
Onions are vegetables used raw or cooked. This entry uses the general USDA raw-onion record; onion powder, onion extracts and green onions are separate food forms.
What it does
The raw reference supplies 9.34 g of carbohydrate, 1.7 g of fiber and 7.4 mg of vitamin C per 100 g. Vitamin C contributes to normal collagen production.
Research context and ingredient forms
The general record does not establish a precise value for every red, yellow or white onion cultivar. It also does not quantify a quercetin supplement dose or prove a health effect of an onion extract.
Using this information
Use peeled edible onion weight for this table. For cooked onions, account for added oil and the changed water content, or choose a matching cooked-food record.
Food sources and composition
| Nutrient | Amount and serving basis | Food and source |
|---|---|---|
| Energy | 40 kcal per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Protein | 1.1 g per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Total lipid (fat) | 0.1 g per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Carbohydrate, by difference | 9.34 g per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Fiber, total dietary | 1.7 g per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Magnesium, Mg | 10 mg per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Potassium, K | 146 mg per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Sodium, Na | 4 mg per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
| Vitamin C, total ascorbic acid | 7.4 mg per 100 g edible portion | Onions, raw; Onions, raw SR Legacy April 2018; FDC published 2019-04-01 |
Scientific Research & References
- Onions, raw
2019 · USDA Agricultural Research Service
Limitations: Historical food/preparation-specific composition, not a current brand label or clinical-outcome estimate.
Source assessment recorded.
- USDA National Nutrient Database for Standard Reference, Legacy Release: Documentation
2018 · USDA Agricultural Research Service
Limitations: Historical dataset; values may be analytical, calculated, imputed, or assumed zero. Not clinical-outcome evidence.
Source assessment recorded.
- Vitamin C: Fact Sheet for Consumers
NIH Office of Dietary Supplements
Limitations: Used only for the mapped definition or nutrient role, not a food-specific clinical benefit.
Source assessment recorded.
Related dictionary entries
Products containing it
No label-specific product relationship has been reviewed for this entry.