What Is the Impossible Burger?
The Impossible Burger is the flagship plant-based patty from Impossible Foods, built around a genetically engineered ingredient called soy leghemoglobin — more commonly known as "heme." It's the ingredient responsible for the burger's pink center, the way it browns and "bleeds" on the grill, and a chunk of the beefy flavor that made this product famous in the first place. Impossible Burger is sold both in restaurants (it was an early staple at Burger King's Impossible Whopper and White Castle's Impossible Sliders) and in the frozen aisle at most major grocery chains, usually as either individual patties or a ground "Meat From Plants" tube.
Since its 2019 nationwide grocery launch, Impossible Foods has reformulated the recipe more than once. The current version has moved away from wheat-based protein to a soy protein concentrate base, which changes both the allergen profile and, more importantly for this review, the gluten status. We'll get into exactly what that means below.
It's worth understanding what problem Impossible Foods was actually trying to solve. Most earlier veggie burgers — black bean patties, grain-based blends, the classic soy-and-vegetable Boca-style patty — were never trying to fool anyone into thinking they were beef. Impossible Foods took the opposite approach: start from a beef eater's expectations (color, sizzle, char, that specific savory "umami" hit) and reverse-engineer a plant-based product that hits those same notes. That's a very different design goal than "make something nutritious out of vegetables," and it explains a lot about both the ingredient list and the nutrition panel below.
Ingredients
The current Impossible Beef / Impossible Burger ingredient list, per Impossible Foods' own product documentation, is:
Water, soy protein concentrate, sunflower oil, coconut oil, and 2% or less of: natural flavors, methylcellulose, cultured dextrose, modified food starch, yeast extract, dextrose, soy leghemoglobin, salt, vitamin E (tocopherols), L-tryptophan, soy protein isolate, zinc gluconate, niacin, thiamine hydrochloride (vitamin B1), pyridoxine hydrochloride (vitamin B6), riboflavin (vitamin B2), and vitamin B12.
A few things worth flagging for shoppers who need to scan labels closely:
- Soy: This is a soy-heavy product — soy shows up three separate times (concentrate, leghemoglobin, and isolate). Anyone with a soy allergy should avoid it entirely.
- Gluten: Older formulations used textured wheat protein. The current recipe is built on soy protein instead, and wheat does not appear anywhere on the ingredient list — a meaningful change from earlier versions that were not suitable for gluten-free diets.
- Methylcellulose: A plant-derived binder (from cellulose, usually wood pulp or cotton) that helps the patty hold together as it heats — it's the same category of ingredient used in a lot of veggie burgers, and it is not derived from any animal source.
Is the Impossible Burger Vegan?
Ingredient-wise, yes — every listed ingredient is plant-derived or synthetic, with none sourced from animals. But there's a wrinkle that keeps the Impossible Burger off most "certified vegan" lists, and it's specific enough that it's worth explaining rather than glossing over.
To get FDA approval for soy leghemoglobin as a food additive, Impossible Foods had to prove it was safe for human consumption. The company did this through animal testing — feeding the heme protein to rats to establish a safety profile before the FDA would sign off on it for grocery store sale. That testing history is why the Impossible Burger has never carried a Vegan Society or Certified Vegan logo, even though nothing in the finished product itself comes from an animal.
Practically speaking, most plant-based eaters treat this as a personal-values call rather than a bright line. Vegans who avoid animal testing on principle — even testing tied to regulatory approval rather than product development — tend to skip Impossible products in favor of Beyond Meat, which has not gone through the same testing history. Vegans whose primary concern is what ends up on their plate (no meat, dairy, eggs, or other animal-derived ingredients) generally consider it fine. Either way, it's a distinction worth knowing before you buy, and it's the kind of detail you can cross-check yourself using the spvegan.com ingredient checker against any packaged food's declared ingredients.
Nutrition Facts
Here's how a 4oz (113g) Impossible Burger patty compares to its closest plant-based rival and to a conventional 80/20 ground beef patty of the same size, based on the brands' published nutrition panels:
| Nutrient | Impossible Burger | Beyond Burger | 80/20 Ground Beef (typical) |
|---|---|---|---|
| Calories | 240 | 230 | ~287 |
| Total Fat | 14g | 14g | ~21g |
| Saturated Fat | 8g | 2g | ~8g |
| Cholesterol | 0mg | 0mg | ~80mg |
| Sodium | 370mg | 310mg | ~75mg |
| Carbohydrates | 9g | 8g | 0g |
| Fiber | 3g | 2g | 0g |
| Protein | 19g | 21g | ~19g |
| Iron | 4.5mg | 4mg | ~2mg |
The two headline numbers here: sodium and saturated fat. Both plant-based patties run noticeably higher in sodium than conventional beef, and Impossible in particular matches beef's saturated fat gram-for-gram — almost entirely from the coconut oil used to mimic beef fat's mouthfeel. If you're eating Impossible Burgers because you assume they're automatically the "healthier" choice, the honest read is that they're a meat alternative built primarily to replicate beef's eating experience, not a lighter or more heart-friendly product across the board. Where they clearly win is cholesterol (zero, versus meaningful amounts in beef) and the added fiber and iron.
Taste and Texture
This is where Impossible has built its reputation, and it largely holds up. Cooked on a flat-top or grill, the patty browns similarly to ground beef, develops a comparable crust, and the interior stays pink until it's cooked through — the leghemoglobin is doing real work here, not just coloring the raw patty. The flavor leans savory and slightly smoky even without seasoning, and most tasters — including people who regularly eat meat — describe it as closer to beef than the majority of pea-protein or soy-based veggie burgers on the market.
Where it falls short of real ground beef: juiciness. Straight off the grill with no toppings, it can taste slightly denser and less juicy than a fatty beef patty, and the fat rendering behaves a little differently since it's coming from coconut and sunflower oil rather than intramuscular fat. Under a bun with cheese, lettuce, tomato, and condiments — which is how most people actually eat burgers — that gap mostly disappears. It also holds together well on the grill without the crumbling issues that plague some bean- or grain-based veggie patties, which matters if you're cooking for a mixed group of vegans and non-vegans and don't want to explain why your burger fell apart.
Cooking Tips
A few things make a real difference in closing the gap between an Impossible Burger and a beef patty. First, don't overcook it — because there's no risk of foodborne illness from undercooked plant protein the way there is with raw beef, you can pull it off the heat as soon as it's browned through, and letting it go much past that dries it out fast since it doesn't have intramuscular fat continually basting it as it cooks. Second, a hot, well-oiled pan or grill matters more here than with beef; the patty needs a hard sear to develop the crust that gives it a meat-like bite, since the interior alone doesn't build much textural contrast. Third, season it — a pinch of salt and pepper on the exterior before cooking goes further on Impossible than on beef, since it doesn't have rendering fat carrying seasoning through the whole patty the way beef does. None of this is complicated, but skipping it is the most common reason people find the burger underwhelming straight out of the package.
Price and Availability
Impossible Burger patties are widely stocked in the frozen or refrigerated meat-alternative section at Target, Walmart, Kroger, Safeway/Albertsons-family stores, and most regional grocery chains, typically in 8oz (2-patty) or 24oz (6-patty) packages. Pricing varies by retailer and region, but expect to pay roughly the equivalent of $6–$9 per pound — generally a bit more than conventional ground beef, though the gap has narrowed since the product's 2019 launch as Impossible Foods has cut suggested retail prices to chase price parity with meat. It's also common on restaurant menus, from fast-casual burger chains to independent restaurants that list it as a swap-in for their standard beef patty.
How It Compares to the Alternatives
| Product | Base Protein | Vegan-Certified? | Protein (4oz) | Best For |
|---|---|---|---|---|
| Impossible Burger | Soy | No (animal-tested heme) | 19g | Closest beef-like taste and "bleed" |
| Beyond Burger | Pea | Yes | 21g | Strict vegans wanting a beef-style patty |
| MorningStar Farms Grillers | Soy | No (some varieties contain egg/dairy) | ~11g | Budget option, but check the label — not all varieties are vegan |
| Dr. Praeger's veggie burgers | Vegetables/grains | Mostly yes | ~5-8g | Lighter, whole-food-style patty over a "meat mimic" |
If a certified-vegan label matters to you, Beyond Burger is the straightforward swap — same burger-joint experience, no animal-testing asterisk. If you're less concerned with certification and more focused on taste, Impossible remains the benchmark most other brands are still chasing.
Who Should Buy the Impossible Burger?
It's a strong fit for people transitioning off meat who don't want their burger night to feel like a downgrade, for households mixing vegan and non-vegan eaters at the same cookout, and for anyone who's tried thinner, crumblier veggie patties and been unimpressed. It's a weaker fit for anyone managing sodium or saturated fat intake, anyone with a soy allergy, and strict vegans who avoid products connected to any animal testing, regardless of where in the process that testing happened.
Final Verdict
The Impossible Burger still does what it set out to do: close the gap between a veggie burger and an actual beef burger, in flavor, browning, and mouthfeel, better than almost anything else on the shelf. It's not the cleanest-label product in the plant-based aisle, it runs high in sodium and saturated fat, and the animal-testing history behind its signature ingredient is a legitimate reason some vegans pass on it. But judged on what it's actually trying to be — a beef replacement rather than a health food — it earns its reputation.
Rating: 8/10 — Excellent taste and texture, held back half a point by sodium/saturated fat content and the lack of vegan certification, which will be a dealbreaker for some shoppers and a non-issue for others.
