We Threw Up So You Wouldn't Have To: What Happened When 7 AlsoFoundIn Employees Drank Premier Protein

I was the first one to drink it.

Thirty grams of protein, 160 calories, caramel flavor. The number-one-selling ready-to-drink protein shake in America — Premier Protein. Over 9,000 five-star reviews on Walmart alone. Endorsed by dietitians on Instagram. Stacked floor-to-ceiling at Costco.

I cracked the cap, took one full sip, and my body said no.

Not in the subtle way your stomach turns when something's a little off. In the immediate, involuntary way — the way your body rejects something it recognizes as foreign. It tasted like chemicals dissolved in caramel syrup. Within two minutes, I threw up.

Then we gave it to the rest of the team.

The experiment

Seven AlsoFoundIn employees. One shake each. No one was told what the others experienced beforehand. Here's what we learned.

Group A — the clean eaters (4 people). These four have eaten whole, unprocessed food for years. We're talking single-ingredient groceries: chicken, steak, shrimp, broccoli, rice. No boxed meals. No frozen dinners. No fast food. Their palates and digestive systems have been calibrated to real food for a long time.

All four threw up.

I (K. Baker) went first. The taste registered as chemical before it registered as caramel. The other three had the same reaction at varying speeds — within minutes, their bodies rejected the shake.

Group B — the moderate eaters (3 people). These three look healthy on the outside and eat reasonably well, but their diets include the usual mix: fast food in moderation, the occasional box of Hot Pockets, frozen meals, McDonald's when it's convenient. Their systems are accustomed to processed food.

None of them threw up.

They didn't love the taste — one described it as "a little fake" — but their bodies accepted it without incident. They finished their bottles.

Seven people. Same shake. The only variable was diet history. The pattern was stark.

What's actually in the bottle

Here's the full ingredient list for a Premier Protein Caramel Shake, copied directly from the label:

Filtered Water, Milk Protein Concentrate, Calcium Caseinate, Contains Less Than 1% of Sunflower Oil or Soybean Oil, Natural and Artificial Flavors, Cellulose Gel and Cellulose Gum, Salt, Sucralose, Acesulfame Potassium, Carrageenan, Tripotassium Phosphate, Dipotassium Phosphate, Sodium Hexametaphosphate, Vitamin and Mineral Blend, Magnesium Phosphate, Sodium Ascorbate.

That's 30 grams of protein wrapped in a chemical infrastructure most people never read. Let's pull the file on the ones that matter.

Sucralose. An artificial sweetener 600 times sweeter than sugar, made by chlorinating sucrose. Research has linked it to disrupted gut microbiome, glucose intolerance, and inflammatory markers. A 2023 study in the Journal of Toxicology and Environmental Health found that sucralose damages DNA at concentrations achievable through normal consumption.

Acesulfame Potassium (Ace-K). Another artificial sweetener, almost always paired with sucralose to mask its metallic aftertaste. Studies have raised concerns about its potential carcinogenicity and its effect on gut bacteria, though regulatory agencies still classify it as safe. The fact that it needs a second artificial sweetener to cover the taste of the first one tells its own story.

Carrageenan. A thickener extracted from red seaweed. The degraded form (poligeenan) is a known inflammatory agent. The food-grade form is debated — some researchers argue it degrades in the acidic environment of the stomach. The EU's European Food Safety Authority re-evaluated it in 2018 and maintained its approval, but independent researchers have called for further review. It's been linked to gastrointestinal inflammation and has been removed from many organic products voluntarily.

Cellulose Gel and Cellulose Gum. Processed wood pulp used as a thickener and stabilizer. Generally recognized as safe, but essentially indigestible filler that adds texture without nutrition.

Sodium Hexametaphosphate. An emulsifier and sequestrant. Used in industrial water treatment. Also in your protein shake.

Natural and Artificial Flavors. "Natural flavors" is one of the most legally permissive terms in food labeling — it can refer to hundreds of chemical compounds derived from any natural source. "Artificial flavors" means exactly what it sounds like: synthesized in a lab. Neither term tells you what you're actually consuming.

The legal cloud

Premier Protein's parent company, BellRing Brands, has faced lawsuits alleging that its shakes contain elevated levels of lead. In June 2023, a federal lawsuit filed in the Northern District of California alleged that independent ISO-accredited laboratories found excessive lead levels in Premier Protein's ready-to-drink shakes and plant-based protein powders. The complaint accused BellRing of deceptively touting its products as healthful despite the alleged contamination.

Consumer Reports' October 2025 investigation tested 23 protein products and found that more than two-thirds exceeded the 0.5 microgram daily safety threshold for lead. While the worst offenders in that report were plant-based powders, the investigation reinforced a broader reality: the supplement industry operates with virtually no pre-market safety testing, and consumers are drinking on faith.

Why the clean eaters threw up

We're not scientists. We didn't run this in a controlled lab. But the pattern aligns with something nutritionists and gastroenterologists have observed: when your body has been running on whole, unprocessed food for an extended period, your gut microbiome and digestive enzymes adapt to that baseline. Introduce a cocktail of artificial sweeteners, emulsifiers, and chemical stabilizers, and the system flags it as a threat.

The three team members who didn't throw up? Their digestive systems already had a tolerance for processed food. Their guts were accustomed to the kinds of additives Premier Protein contains because they encounter them regularly. That's not a health advantage — it's a numbed response.

Think of it this way: if someone who never drinks alcohol takes three shots of whiskey, they'll feel it immediately. Someone who drinks regularly might barely notice. That doesn't mean the whiskey is harmless for the regular drinker — it means their body has stopped sounding the alarm.

Who this shake is actually for

Premier Protein markets itself as a health product. But based on what's in the bottle and how clean-eating bodies responded to it, the more accurate picture is this: it's a meal-replacement product designed for convenience, not for health.

If you're recovering from surgery and can't eat solid food, it delivers protein. If you're elderly and struggling to meet basic protein needs, it's better than nothing. If you're a shift worker grabbing something from a gas station because you haven't eaten in ten hours, it fills a gap.

But if you're someone who eats well, trains regularly, and is choosing Premier Protein because you believe it's a clean source of nutrition — you deserve to know that four out of four clean eaters on our team couldn't keep it down. Their bodies treated it like what it is: a processed chemical product wearing a protein label.

The file

We don't tell you Premier Protein is poison. We don't tell you it's fine. We ran a small, honest experiment with our own team, and we're handing you the result alongside the ingredient list, the additive research, and the legal record.

Read the label. Decide with your eyes open.

Disclosure: AlsoFoundIn is an independent publication. We have no financial relationship with Premier Protein, BellRing Brands, or any competing protein brand. Nobody paid us to write this. Nobody asked us not to.