Psyllium husk powder

One US cup of psyllium husk powder weighs between 144 and 240 grams (5.1 to 8.5 ounces), depending on how the cup is filled and which source measured it. That range is the answer; a single number would not be. Every figure behind it is below, with the method each source used.

Psyllium husk powder density varies enormously across brands, from about 144 g/cup for coarser grinds up to about 240 g/cup for the finest, a 67 percent spread driven by grind fineness rather than measurement error. Serious gluten-free baking recipes universally specify psyllium by weight in grams for this reason.

Psyllium husk is the outer coating of the seed of Plantago ovata, a plant grown mainly in India, and it works in gluten-free baking by hydrating into a viscous gel that mimics some of the structural role of gluten. It also has a long-established use as a bulk-forming fiber supplement, which is why it sits between the baking and supplement aisles and often carries supplement-style nutrition labels rather than baking-ingredient labels.

King Arthur has no psyllium husk powder entry in their Ingredient Weight Chart, so this catalog entry is based entirely on producer nutrition labels and gluten-free baking references.

The density spread across brands is best understood as three tiers driven by how finely each producer mills the husk. Coarser grinds, like NOW Foods, pack at roughly 9 grams per tablespoon, giving about 144 g/cup. Medium grinds, like Anthony's and It's Just, run about 12 grams per tablespoon, giving about 192 g/cup. The finest, silkiest grinds, like Viva Naturals and Vitacost, reach roughly 15 grams per tablespoon, giving about 240 g/cup. Physical reason: psyllium husk is a light, fluffy fibrous material with a lot of void space when coarsely ground; grinding it into a finer powder progressively eliminates that air and lets the particles pack much more tightly. Different producers publish their products under different fineness specifications, and the label almost never says which grind you are buying.

Grind fineness is genuinely not disclosed on most retail labels. Some brands use terms like 'finely ground' or 'silky' or 'coarse', but there is no industry standard. Two products both labeled 'psyllium husk powder' can differ by 60 percent in density and still be honestly labeled. This is why NOW Foods explicitly disclaims volume on their bag with the language 'this product is sold by weight not volume' — an unusually candid admission that their gram-per-tablespoon figure is approximate.

Psyllium husk powder is denser than whole psyllium husk (flakes), which packs at roughly 5 grams per tablespoon or about 80 g/cup. Powder is not a 1:1 volume substitute for whole husk in either direction. Multiple gluten-free baking authorities recommend using about 15-25 percent less powder than whole husk by weight when substituting, because the powder's higher surface area absorbs more water per gram and forms a stiffer gel.

Practical guidance for bakers: always weigh psyllium husk powder in grams rather than measuring by cup or tablespoon. A recipe that calls for '2 tablespoons of psyllium husk powder' without a gram weight is genuinely ambiguous, since the outcome depends on which brand the recipe developer used and which brand the reader has on hand. Where a recipe does specify grams, that is the number to trust. The middle of the range, around 160-192 g/cup, is a defensible fallback for volume-only recipes if a scale is not available, but users should expect noticeable texture differences depending on brand.

Whole psyllium husk (flakes) is a distinct product and should be entered separately in this database if needed.