Psyllium husks

Psyllium is simply the outer husk of a seed, dried and ground — no fermentation, aging, or processing that would raise histamine.

• Used as a fiber supplement — psyllium husks are most commonly taken for digestive support and aren't associated with histamine in any meaningful way

• Gut effects worth noting — psyllium can influence gut motility and the gut microbiome over time; while this isn't a direct histamine mechanism, some people with histamine sensitivity find that gut health plays a role in how they tolerate foods overall

For most people with histamine sensitivity, plain psyllium husks are considered a comfortable choice.