MET-Rx
Fruity Cereal Crunch
TL:DR
In 2 Sentences
A true meal‑replacement‑style bar: about 380 calories with 30g of protein, fortified vitamins/minerals, and a nostalgic, crunchy ‘fruity cereal’ profile. It uses a blended protein system (soy plus dairy and egg) for a complete amino acid spread and that signature cereal‑crisp texture.
When to choose MET-Rx Fruity Cereal Crunch
Best for high‑output days, long commutes, post‑workout refuel, or anyone who wants a substantial, protein‑heavy bar that actually feels like food. Not ideal if you’re minimizing added sugar or avoiding artificial colors.
What's in the MET-Rx bar?
If you grew up fishing for the rainbow bits in a bowl of cereal, MET‑Rx Protein Bar, Fruity Cereal Crunch, brings that memory back—then loads it with 30g of protein.
The METAMYOSYN blend leans on soy as the base (including crisped soy for that airy crunch), then folds in whey and milk isolates plus a touch of egg white for complete amino acids—top‑tier protein for a bar.
The flip side: carbs and sugars are big too, powered by syrups and cereal‑style starches, with allulose adding sweetness without landing on the “added sugars” line. Fat comes from palm‑based coating for structure alongside canola/sunflower oils and a little cashew butter for creaminess.
The “fruity cereal” vibe is built with a confetti cereal mix, natural flavor, and a light yogurt‑milk note, so expect a dessert‑leaning bar with mini‑meal calories and a candy‑cereal finish.
- Protein
- 30 g
- Fat
- 14 g
- Carbohydrates
- 43 g
- Sugar
- 23 g
- Calories
- 380
Protein
3015HIGHThirty grams of protein come from MET‑Rx’s METAMYOSYN blend: mostly soy protein (including crisped soy), backed by milk proteins (whey and milk isolates) and a touch of egg white. That mix gives you complete amino acids and solid digestibility thanks to the dairy and egg, while soy lends texture and crunch. The isolates are low in lactose, though the bar also includes nonfat milk and yogurt powder, and milk and egg allergens still apply.
Fat
149HIGHThe 14g of fat are a mix of fractionated palm and palm kernel oils (semi‑solid, more saturated, great for a stable coating) plus canola and sunflower oils and some nut fat from cashew butter. The palm fraction skews saturated and highly processed, while the seed and nut oils supply more heart‑friendly unsaturated fats. It’s a pragmatic blend for shelf life and that cereal‑coating snap; if you’re watching saturated fat, note the palm oils near the top of the list.
Carbs
4320HIGHMost of the 43g of carbs come from refined sweeteners and cereal‑style starches—sugar, brown rice syrup and corn syrup, plus corn/tapioca starch in the crunchy crisps and confetti bits. That’s quick‑burning fuel that will feel more like a cereal bar than slow‑release oats or dates; protein and fat will temper the rise a little, but this leans fast energy. Allulose—a low‑calorie sugar—adds sweetness and bulk with less glycemic punch, though it still counts toward total carbs.
Sugar
234HIGHSugar sits on the higher side at 23g, driven by sugar itself, brown rice and corn syrups, and the candy‑like confetti cereal; lactose from dairy adds a little more. The bar also uses allulose, a low‑calorie “rare sugar” that sweetens without counting as added sugar, which is why the sweetness can feel bigger than the sugar line suggests. There’s no fruit here—this is dessert‑style sweetness from refined sources.
Calories
380210HIGHAt 380 calories, this eats like a mini‑meal. Protein delivers a hefty share, but a generous helping of sugary/starchy carbs and a moderate 14g of fat push the total well above most bars. Allulose contributes fewer calories than sugar, yet the combination of syrups, starches, and palm‑based coating still makes this a high‑energy option—useful when you truly need the calories.
Vitamins & Minerals
This bar is fortified like a light multivitamin: 20% DV for a dozen vitamins, plus minerals such as calcium and iron (20% DV), zinc and phosphorus (25% DV), and a notably high 60% DV of copper. The premix provides most of that lift; dairy ingredients add some calcium and phosphorus, and cashew contributes a little copper. If you already supplement, account for the extra micronutrients here.
Additives
To land the “fruity cereal” experience, the recipe leans on refined helpers: synthetic colors (Red 40, Yellow 5/6, Blue 1) for the confetti pop, soy lecithin to keep fats smooth, and xanthan gum for cohesion. Allulose is a modern low‑calorie sweetener used for bulk and sweetness, and tocopherols (vitamin E) help keep the oils fresh. It’s a long‑shelf‑life, candy‑meets‑cereal formula rather than a short‑ingredient‑list, whole‑food bar.
Ingredient List
Soybeans
Cassava root
Defatted soybean flakes
Skim cow milk
Cow's milk whey
Cow's milk whey
Eggs
Sugarcane and sugar beet
Brown rice
Field corn starch
What are people saying?
Sources
Range
“I buy the Met-RX Big 100 bars because they’re 30-32 grams of protein and they’re quite tasty.”
“I actually buy their cookies n cream bars pretty often. Like the taste, high protein and live an active lifestyle (commute on bike + workout often) so the calories are pretty good for my needs.”
“My favorite of all time it the Met-Rx super cookie crunch bar. 100g Bar for 410 calories, 32g protein, 42g carbs, 14g fat. It’s high in sugar but once in a while it’s my sweet meal. They taste SO good and take me a long time to eat”
Main Praise
Across reviews, three strengths keep coming up. First, the protein‑to‑effort ratio is exceptional: around 30g of protein in a single bar that you can eat one‑handed.
Redditor CalypsoBrat buys Big 100s precisely for that reason—big protein, easy to like—and they’re not alone. Second, it’s substantial.
Amazon reviewer Mark calls it a reliable meal replacement that “keeps you full,” and Men’s Health backs the concept by naming Big 100 a top high‑calorie, high‑protein pick. Third, many flavors hit the mark on taste and texture.
Alex on Amazon ranks several as go‑tos, praising the combo of crunchy‑chewy layers that feel more like a candy bar than a chalky compromise. Even Eat This, Not That!
—which ultimately passes for personal sugar reasons—admits the Vanilla Caramel Churro flavor is genuinely enjoyable to eat.
Main Criticism
Two downsides dominate. The first is sweetness and the sources behind it.
You’re looking at dessert‑style sugar (roughly 23g in Fruity Cereal Crunch) plus allulose, which boosts the sweetness without counting as added sugar—so it tastes even sweeter than the label suggests. Several reviewers found the fruity flavor especially candy‑like, with one Amazon reviewer noting it can tint your tongue like kids’ cereal.
The second is texture/quality variance: a few buyers report bars that are overly hard (cue the “watch your teeth” warnings) or occasional quality‑control hiccups like odd hard chunks or underweight bars.
There’s also the ingredient philosophy to consider: palm‑based coating for structure and synthetic colors for that confetti look won’t appeal if you’re aiming for a short, “whole‑food” label.
The Middle Ground
So where does that leave us? Somewhere in the middle, which—ironically—is exactly where most people snack.
Big 100’s job is to be portable, satisfying food with meaningful protein, and it does that better than most bars. The tradeoff is clear: refined carbs and a candy‑adjacent flavor profile.
For some, that’s a feature, not a bug; Redditor CriticalLootRNG bikes, lifts, and appreciates the calories. For others, like the Eat This, Not That!
tester, the added sugar bumps it out of everyday rotation. The nutrition facts back both views: 380 calories, 30g protein, 14g fat, and 43g carbs with 23g sugar is more mini‑meal than dainty snack.
If you’re sensitive to synthetic colors or prefer oats, nuts, and dates, you’ll bristle at the confetti. If you want a bar that actually tides you over, this one works.
And as GranolaBarHero puts it, some flavors won’t blow your mind—or your goals—either way.
What's the bottom line?
MET‑Rx Big 100 Fruity Cereal Crunch is a protein bar that doesn’t pretend to be anything else: it’s big, it’s sweet, and it’s built to satisfy. The blended protein (soy plus dairy and egg) delivers robust amino coverage and the crisped texture people love, while the vitamin/mineral fortification nudges it toward meal replacement territory. The flip side is equally plain: you’re signing up for dessert‑leaning sweetness, palm‑based coating, and synthetic colors.
If your day includes heavy training, long stretches without a meal, travel, or simply a craving for cereal‑candy nostalgia with 30g of protein, it’s a smart, honest pick. If you want a short ingredient list and minimal added sugar, look elsewhere. Flavor choice matters—some reviewers strongly prefer options like Salted Caramel Brownie Crunch or Apple over the more candy‑like ones—and storage helps too (room temperature softens the bite).
Account for the extra micronutrients if you already supplement, and note the allergens (soy, milk, egg). Used intentionally—as a mini‑meal, not a nibble—Big 100 earns its name.
Condensed listicle blurb: A true meal‑replacement bar with 30g of protein and a crunchy, fruity‑cereal bite. Great for high‑output days and long gaps between meals; less great if you’re avoiding added sugar, palm coatings, or synthetic colors.