Mastroianni Brothers Bakery · Breads and Buns
San Francisco Sourdough
One slice (28g) serving of San Francisco Sourdough by Mastroianni Brothers Bakery has 70 calories, less than 1g of sugars and 135mg of sodium, as submitted by Mastroianni Bros Inc. to USDA (FoodData Central 2542434, record updated Aug 6, 2018).
Values for the declared serving and per 100 g. FoodData Central 2542434, available May 25, 2023; USDA record.
Nutrition Facts
* The % Daily Value (DV) tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice. Protein % DV here is not corrected for protein quality.
Computed from the values per 100 g that Mastroianni Bros Inc. submitted to USDA, for the declared 28g serving. They are rounded as FDA requires labels to round; the package in your hand is the authority. Check the USDA record.
- UPC
- 030084222623
- Category
- Breads and Buns
- Records
- 7 under this UPC; this page shows the newest record of this barcode
How it compares with other breads and buns
Per 100 g, it has more sugar than 37% of the 10,293 breads and buns products in USDA's branded database, and it has more sodium than 57% of them.
Where the calories come from: 82% carbohydrate, 0% fat and 18% protein (4 calories a gram of protein or carbohydrate, 9 of fat).
Where it sits among breads and buns: sugar per 100 g
| Per 100 g | This product | Median of the category | Share of the category lower |
|---|---|---|---|
| Total sugars | 3.6 g | 4.7 g | 37% |
| Sodium | 482 mg | 464 mg | 57% |
| Protein | 10.7 g | 8.9 g | 79% |
| Calories | 250 | 267 | 26% |
Source: USDA FoodData Central branded foods, April 30, 2026 release; category statistics computed by GetFoodFacts from 10,293 products, one per barcode.
Other sourdough in this aisle
376 of the 10,293 breads and buns products are named sourdough. Per 100 g their median is 250 calories, 491 mg of sodium and 8.6 g of protein; 170 have less sodium than this one.
| Other brands with less sodium | Sodium per 100 g | Calories per 100 g |
|---|---|---|
| Garlic Sourdough Old Fashioned Bread FIRST STREET | 385 mg | 250 |
| Raley's, French Bread Sourdough RALEY'S | 383 mg | 233 |
| Original Sourdough Bread LAUREL MOUNTAIN BAKERY | 379 mg | 333 |
Source: USDA FoodData Central branded foods, April 30, 2026 release: products in this aisle whose name contains "sourdough", one per barcode.
What is in it
Ingredients (as submitted): WHEAT FLOUR UNBLEACHED, WATER, SALT, YEAST, LESS THAN 2% OF EACH OF THE FOLLOWING: DRIED SOURDOUGH, (WHEAT, RYE), CULTURED WHEAT FLOUR, DRIED YEAST, ASCORBIC ACID ADDED AS A DOUGH CONDITIONER.
The statement lists 9 ingredients at the top level, beginning with Wheat Flour Unbleached, Water, Salt. It has no separate "Contains" line; a major allergen (the nine the FDA requires on labels: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soybeans, sesame) may be named inside the ingredients instead. For allergies, read the package: this is the record USDA holds (updated Aug 6, 2018), not the label on the shelf today.
Source: the ingredient statement Mastroianni Bros Inc. submitted to USDA (FoodData Central 2542434).
More Mastroianni Brothers Bakery breads and buns
| Product | Calories per 100 g | Sugars per 100 g | Sodium per 100 g |
|---|---|---|---|
| Brooklyn Deli Rye Bread | 250 | 0 g | 607 mg |
| Brick Oven Style Italian Soft Rolls | 258 | 1.54 g | 248 mg |
| Kaiser Rolls | 259 | 1.16 g | 250 mg |
| Raisin Bread | 269 | 25 g | 312 mg |
| Italian Unseeded Rye | 273 | 0 g | 424 mg |
Source: USDA FoodData Central branded foods, April 30, 2026 release.
Questions about this product
How many calories are in Mastroianni Brothers Bakery San Francisco Sourdough?
70 per 1 slice (28g) serving, and 250 per 100 g.
How much sodium is in Mastroianni Brothers Bakery San Francisco Sourdough?
135mg per serving (6% of the 2,300 mg Daily Value).
Is this the label on the package today?
It is the record Mastroianni Bros Inc. submitted to USDA, last updated Aug 6, 2018. Recipes change: the package in your hand is the authority.
Sources for this page
- USDA FoodData Central
- this record and every record it is compared with, April 30, 2026 release. fdc.nal.usda.gov
- FoodData Central documentation
- what branded, SR Legacy, Foundation and survey records are. fdc.nal.usda.gov
- USDA Food and Nutrient Database for Dietary Studies
- survey foods and their household portions. ars.usda.gov
- 21 CFR 101.9, Nutrition labeling of food
- the label format, its rounding and the Daily Values. ecfr.gov
- 21 CFR 101 subpart D, Nutrient content claims
- the FDA thresholds the comparisons count. ecfr.gov
- FDA, How to Understand and Use the Nutrition Facts Label
- the 5% and 20% Daily Value rule. fda.gov