Special K Protein Plus: 15.4g Protein per 1 1/3 Cup, Labelgrade B (78/100)

The short answer

Kellogg’s Special K Protein Plus delivers 15.4g of protein for 212 calories in a 1 1/3 cup (59g) serving, measured dry (USDA FDC 2518898) — that’s 26.1g per 100g, a genuinely high protein density for a breakfast cereal. The trick is that the wheat-and-rice base is reinforced with wheat gluten and soy protein isolate, the same lever most “protein” cereals pull. It earns a B (78/100): the protein and fiber numbers are strong, but it’s still a sweetened grain cereal, and the sodium load drags the grade down.

Why the B

The honest read: protein density and fiber are doing the heavy lifting, and they’re legitimately good. What holds it at a B rather than higher is the combination of moderate added sugar and a sodium level that’s high once you normalize per 100g. Nothing here is a disqualifier — it just isn’t a clean-label product, and the grade reflects that.

The milk asterisk worth knowing

Boxes in this category almost always advertise their protein “with 1/2 cup skim milk,” and Special K Protein Plus is no exception. The 15.4g above is the cereal alone, dry. Pour on half a cup of skim and you’re adding roughly another 4g of protein (plus ~40 calories), which is how the marketing reaches its headline number. That’s not deceptive — milk is the normal way people eat it — but if you’re tracking macros, log the cereal at 15.4g and add your milk separately. Eaten dry as a snack or made with water, the cereal number is what you get.

How it stacks up against the alternatives

The useful comparison runs in two directions. Against ordinary cereal, this is a clear step up: plain corn or rice flakes deliver 2-3g of protein per bowl, so 15.4g is five-to-seven times the protein for a familiar flake you already know how to eat.

Against the grain-free “keto” cereals, it loses on carbs and sugar:

Magic Spoon and Catalina Crunch hit comparable protein with essentially no sugar and a quarter of the carbohydrate, because they replace grain with milk-protein and fiber blends. The trade is price and availability: those run roughly $8-10 a box and live online or in specialty aisles, while Special K Protein Plus is a standard supermarket SKU at a fraction of the cost per serving. If your goal is low-carb, the keto cereals win outright. If your goal is “more protein than my usual cereal without changing my routine or budget,” this is the pragmatic pick.

Who it’s for

This is a familiar, affordable protein bump for breakfast — the right call for someone who already eats cereal and wants to roughly triple the protein without buying anything exotic or learning a new habit. The 4.72g of fiber is a real bonus most cereals can’t match. Just go in clear-eyed: it’s still a grain cereal with about 8g of added sugar and a notable sodium load, so it’s a smart upgrade rather than a “health food.” If you’re managing carbs or sugar tightly, a grain-free cereal or a savory egg-based breakfast will serve you better.

Ingredients

Whole wheat, rice, wheat gluten, sugar, soy protein isolate, wheat bran, then 2% or less of cinnamon, malt flavor, salt, natural flavors, and BHT (a preservative). Fortified with calcium carbonate, reduced iron, and a B-vitamin and vitamin D3 blend. The protein boost comes specifically from the wheat gluten and soy protein isolate layered onto the whole-wheat-and-rice base. (Verbatim from the USDA Branded Foods entry, FDC 2518898.)

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Scope: This page applies specifically to Kellogg'S Special K Cereal Protein Plus 19oz · UPC 00038000143670. Other sizes, flavors, or formulations may differ.