Psyllium Husk, Whole

One US cup of psyllium husk, whole weighs 80 grams. Going the other way, 100 grams is about 1.25 cups.

Also called whole psyllium husks, psyllium husk flakes, psyllium seed husks, whole psyllium husk, ispaghula husk, psyllium husks.

Whole psyllium husk weighs 80 g/cup with tight convergence across four major brands. This is the light flake form of psyllium, not the milled powder form (see the psyllium-husk-powder entry, which runs 144-240 g/cup depending on grind fineness).

Psyllium husk is the outer coating of the seed of Plantago ovata, a plant grown mainly in India. In the whole form, it looks like small light brown flakes rather than a fine powder. All commercial whole husk is essentially the same physical thing — the natural husk cleaned and dried, without further milling — which is why producer densities converge so tightly. In gluten-free baking, whole husk hydrates into a viscous gel that mimics some of the structural role of gluten, and many gluten-free bread authorities including The Loopy Whisk explicitly prefer whole husk over powder for bread work because the coarser flakes produce a more elastic dough and less gummy crumb.

King Arthur has no psyllium entry of any kind in their Ingredient Weight Chart, so this catalog entry is based entirely on producer nutrition labels and one professional reference.

Four producers converge at exactly 5 grams per tablespoon (80 g/cup): NOW Foods, Anthony's, and both Yerba Prima SKUs (organic and non-organic). Diet Doctor's low-carb reference guide independently confirms the same 5g/tablespoon figure. NOW Foods carries the label disclaimer 'this product is sold by weight not volume,' the same language they use on their psyllium husk powder product; on whole husk specifically the disclaimer appears to be a stock warning rather than a real density-uncertainty flag, since the four independent brands converge to within labeling precision.

The convergence contrasts sharply with the situation for psyllium husk powder, where producer density spans 144 to 240 g/cup depending on how finely each brand grinds their product. The whole husk form does not have this variance because there is no grind-fineness parameter — the husk is the husk. Different brands may differ in husk purity (sold values range from 85 to 99 percent psyllium content), but the physical form itself is consistent.

Whole husk to powder substitution: the two forms are not 1:1 interchangeable. Weight-for-weight, powder is more effective as a binder because grinding increases surface area and water absorption. Multiple gluten-free baking authorities recommend using 15-25 percent less powder than whole husk when substituting by weight. By volume, powder is roughly 2x denser than whole husk (per the Diet Doctor reference: half a tablespoon of powder equals one tablespoon of whole husk nutritionally, both at 5g), so volume substitution requires roughly double the whole husk volume to match a powder volume.

Outside the US and Canada, whole psyllium husk is sometimes sold under the name 'ispaghula husk,' particularly in the UK and parts of Europe. It is also the active ingredient in bulk-forming laxatives like Metamucil and Fybogel, so consumer product familiarity with the flake form extends well beyond the gluten-free baking market.

Practical guidance: for gluten-free bread recipes that specify psyllium by weight in grams, whole husk at 5 g/tablespoon (80 g/cup) is a reliable volume conversion across all major brands. Bakers substituting between whole and powder forms should always work by weight rather than volume, and should adjust the amount by 15-25 percent in the direction of powder (less by weight, more by volume).