Vital Wheat Gluten in Sourdough

What vital wheat gluten actually is

Vital wheat gluten (VWG) is extracted gluten protein — 75-80% protein by weight, roughly six times a bread flour's protein percentage. It is not a flour you swap in for bread flour or whole wheat; it's a strengthening additive you mix into an existing flour blend, typically at 1-3% of total flour weight. Bob's Red Mill is the standard US supplier and the source for the numbers on this page.

The reason it exists: some flour blends can't hold enough gluten on their own. All-purpose flour, ancient grains (spelt, einkorn), and high percentages of whole grain all have lower or weaker functional gluten than bread flour — VWG boosts the gluten content of the finished dough without changing which base flour you're using.

How much to add, and to what

The sourced dosage range is 1-3% of total flour weight. The one concrete worked example in the source data: 2% VWG added to a 100% whole-wheat dough "rescues oven spring" — meaning it gets a dense, low-gluten dough closer to the rise you'd expect from bread flour.

VWG is extremely hygroscopic — it absorbs 1.6× its own weight in water, well above any standalone flour on this site (the highest standalone absorption multiplier, dark rye, is 1.10×). The practical hydration rule from the source: increase total hydration by about 1% for every 1% of VWG added. Add the VWG with your main dough water rather than dry-mixing it into the flour, to avoid clumping.

5 recipes on this site where it applies

These are recipes on this site whose flour mix includes whole wheat and/or rye — flours whose own specifications document reduced or absent gluten function — plus one spelt recipe, on the strength of spelt's own documented fragile gluten. None of these formulas call for VWG by default; this is where the general 1-3% principle from Bob's Red Mill applies if your loaf needs more structure than the base flour blend gives it.

100% Whole Wheat Pan Loaf (whole-wheat-loaf) — 100% whole wheat, 80% target hydration (75-85% range). This is the source's own worked example: 2% VWG, and roughly 2% more water on top of the recipe's stated hydration.

Spelt Hearth Loaf (spelt-loaf) — 80% spelt, 20% bread flour, 70% target hydration (65-75% range). Spelt's gluten tears easily and doesn't tolerate extended fermentation; VWG toward the lower end of the 1-3% range (with the matching small hydration bump) adds resilience without masking spelt's flavor.

Ciabatta Integrale (ciabatta-integrale) — 65% bread flour, 30% whole wheat, 5% rye, 85% target hydration (80-90% range). Structure matters most here — ciabatta's whole point is the huge irregular open crumb, and it's asking a 30%-whole-grain blend to hold 85% hydration. The whole-grain fraction is large enough that a dose toward the middle of the 1-3% range is more likely to help than at the other recipes below.

Country Loaf (country-loaf) — 80% bread flour, 15% whole wheat, 5% rye, 75% target hydration (72-80% range). The weak-gluten fraction here is only 20% of the total, so this sits at the low end of where VWG is worth considering — many bakers run this formula with no VWG at all.

Pain de Campagne, rye variant (pain-de-campagne) — 75% bread flour, 15% whole wheat, 10% rye, 75% target hydration (72-78% range). Same logic as the country loaf, with a slightly larger (25%) weak-gluten fraction from the extra rye.

When you don't need it

Recipes built on a single high-protein flour don't need VWG — their own flour spec already puts working gluten in range. Three examples from this site: the baguette (100% bread flour, 68% hydration), focaccia (100% bread flour, 80% hydration), and Neapolitan pizza (100% Type 00, 65% hydration) — Type 00's own specification runs 11-12.5% protein for the pizza grade, comparable to bread flour. Adding VWG to a recipe that's already built on a single strong-gluten flour mostly just tightens the crumb — it's solving a problem those recipes don't have.

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