Guinness Draught

Classified by WHO's IARC as a Group 1 carcinogen — definitively known to cause cancer in humans. Even moderate alcohol consumption is causally linked to cancers of the breast, colon, esophagus, larynx, liver, and oropharynx. There is no safe level of alcohol consumption per the WHO (2023).

Brewing water; the dominant ingredient by volume.

The primary glyphosate-residue vector in beer. Conventional barley in North America is commonly sprayed with glyphosate (Roundup) as a pre-harvest desiccant to dry the grain uniformly for combine harvesting; residues persist through malting, mashing, and fermentation.

Unmalted, deeply roasted barley that gives the stout its dark color and coffee notes; can concentrate residues during the kilning process.

Whole hop flowers — traditional ingredient with mild antimicrobial polyphenols (xanthohumol, isohumulones).

Saccharomyces strain used for fermentation; not a health concern.

Inert pressurized gas inside the can widget that creates the signature creamy head — not metabolized; not a health concern.