Guinness draught stout is a dark Irish ale at 4.1-4.2% ABV with a distinctive creamy nitrogen-infused head. It is often assumed to be high in iron (a myth — it contains only modest amounts), but it does provide small amounts of B vitamins, folate, silicon, and antioxidant polyphenols from the roasted barley that gives it its dark colour. A pint contains around 2.3 units and 210 kcal.
The iron-rich reputation of Guinness is a myth; a pint provides around 0.3mg iron — a trivial amount. Its polyphenols from roasted malt are its most nutritionally distinctive feature among mainstream beers.
Where Stout, Guinness Stands Out
Macronutrients per 100g
Vitamins & Minerals
| Nutrient | Per 100g | % Daily Value* | Level |
|---|---|---|---|
| Potassium | 48.0 mg | 2% | |
| Phosphorus | 26.0 mg | 4% | |
| Chloride | 17.0 mg | 2% | |
| Magnesium | 8.00 mg | 2% | |
| Folate | 6.00 µg | 3% | |
| Calcium | 4.00 mg | 1% | |
| Niacin equivalents (NE) | 1.00 mg | 6% | |
| Niacin (B3) | 0.800 mg | 5% | |
| Iron | 0.200 mg | 1% | |
| Vitamin B6 | 0.080 mg | 6% | |
| Pantothenic Acid (B5) | 0.040 mg | 1% | |
| Riboflavin (B2) | 0.030 mg | 2% | |
| Manganese | 0.010 mg | 1% | |
| Vitamin B12 | 0.000 µg | 0% | |
| Thiamin (B1) | 0.000 mg | 0% | |
| Vitamin D | 0.000 µg | 0% | |
| Vitamin A (RE) | 0.000 µg | 0% | |
| Zinc | 0.000 mg | 0% | |
| Vitamin K | 0.000 µg | 0% | |
| Vitamin C | 0.000 mg | 0% | |
| Selenium | 0.000 µg | 0% | |
| Copper | 0.000 mg | 0% | |
| Trans fat | 0.000 g | — | |
| Maltose | 3.20 g | — | |
| Glucose (dextrose) | 0.000 g | — | |
| Fructose | 0.000 g | — | |
| Sucrose | 0.000 g | — | |
| Cholesterol | 0.000 mg | — | |
| Biotin (Vitamin B7) | 1.00 µg | 2% | |
| 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 →