Port is a fortified Portuguese wine (typically 19-22% ABV) made from grape varieties of the Douro Valley, with fermentation stopped mid-process by adding grape spirit, leaving residual natural sugars. A standard 50ml measure contains around 1 unit and 75-90 kcal. It provides small amounts of polyphenols from the grape skin contact during fermentation. Ruby and vintage ports have more polyphenols than tawny.
A 50ml port is a standard measure equivalent to one unit; as a dessert wine the small serving size naturally limits intake. Ruby port has more antioxidant polyphenols than tawny, which is oxidised during ageing.
Where Port Stands Out
Macronutrients per 100g
Vitamins & Minerals
| Nutrient | Per 100g | % Daily Value* | Level |
|---|---|---|---|
| Potassium | 97.0 mg | 5% | |
| Phosphorus | 12.0 mg | 2% | |
| Magnesium | 11.0 mg | 3% | |
| Chloride | 8.00 mg | 1% | |
| Calcium | 4.00 mg | 1% | |
| Iron | 0.400 mg | 3% | |
| Niacin equivalents (NE) | 0.100 mg | 1% | |
| Copper | 0.100 mg | 10% | |
| Niacin (B3) | 0.100 mg | 1% | |
| Vitamin B6 | 0.010 mg | 1% | |
| Riboflavin (B2) | 0.010 mg | 1% | |
| Vitamin D | 0.000 µg | 0% | |
| Vitamin A (RE) | 0.000 µg | 0% | |
| Manganese | 0.000 mg | 0% | |
| Vitamin B12 | 0.000 µg | 0% | |
| Vitamin E (alpha-TE) | 0.000 mg | 0% | |
| Vitamin C | 0.000 mg | 0% | |
| Selenium | 0.000 µg | 0% | |
| Folate | 0.000 µg | 0% | |
| Thiamin (B1) | 0.000 mg | 0% | |
| Polyunsaturated fat (PUFA) | 0.000 g | — | |
| Trans fat | 0.000 g | — | |
| Monounsaturated fat | 0.000 g | — | |
| Glucose (dextrose) | 4.60 g | — | |
| Fructose | 4.60 g | — | |
| Sucrose | 2.80 g | — | |
| Maltose | 0.000 g | — | |
| Cholesterol | 0.000 mg | — | |
| Retinol (vitamin A) | 0.000 µg | 0% |
* % Daily Value is the proportion of an adult
EU Nutrient Reference Value (NRV) supplied by 100g of this food.
NRVs are the labelling standard — the same basis as the “%RI” figures printed on
food packaging — so these percentages are directly comparable with a shop label.
They are a single adult figure and do not vary by age or sex, which is why they
sometimes differ from UK dietary reference values: the NRV for vitamin C is 80mg
where the UK RNI is 40mg. When Nutriofia assesses your own intake in the
reports and trackers, it uses the age- and sex-specific UK values instead.
Fibre is shown without a percentage. Our fibre values use the UK
Englyst NSP method, while the published 30g daily goal is an AOAC figure — the two
are measured differently and a single percentage would mislead.
How we source and normalise our data →