Isopure vs NutraBio vs GHOST: Which Clear Whey Should You Buy?

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If you’ve read our individual reviews of Isopure, NutraBio, and GHOST clear whey, you already know each one is solid on its own. The harder question is which to actually buy when you’re standing between three tabs, all open, all claiming to be the best. Here’s a direct, side-by-side answer.

Quick answer

If protein-per-serving is your main priority, GHOST wins at 25 grams versus 20 grams for the other two. If you’re optimizing for cost, NutraBio is the cheapest per serving. If you want the widest flavor selection to avoid getting bored, Isopure has the most options at 8 flavors. All three are genuine whey protein isolate, all three are effectively sugar-free, and any of them will do the job of getting a clean 20-25 grams of protein into a glass of water that tastes like juice rather than a shake.

If you want the most protein per serving: GHOST

GHOST delivers 25 grams of protein per serving, a full 5 grams more than Isopure or NutraBio, for about 25-38 cents more per serving. If you’re trying to hit a daily protein target in fewer servings, that extra 5 grams adds up over a week. The tradeoff is a slightly higher calorie count (100 vs. under 80 for NutraBio) and a smaller, rotating flavor lineup — GHOST leans on limited-edition collab flavors rather than a large permanent catalog.

Check Price on GHOST →

If you want the lowest cost per serving: NutraBio

NutraBio comes in at roughly $2.00 per serving, the cheapest of the three, while still delivering 20 grams of protein, under 80 calories, and under 1 gram of carbs. It’s also GMP certified and third-party batch tested, which matters if you want quality assurance without paying a premium brand markup. The flavor lineup (6 options) is smaller than Isopure’s, but reviewers generally rate the taste and mixability as comparable.

Check Price on NutraBio →

If you want the widest flavor selection: Isopure

Isopure has the largest permanent flavor catalog of the three, at 8 options, plus the longest track record in the clear whey category — it’s the brand that arguably created the format. That history comes at the highest per-serving price of the group (~$2.49). If flavor boredom is what usually kills your protein habit, the extra variety may be worth the premium.

Check Price on Isopure →

What all three have in common

• All three are genuine whey protein isolate (not concentrate), which means minimal lactose and fat — the reason they mix clear instead of cloudy.
• All three are effectively sugar-free with no added sugar.
• All three mix with water, not milk, and are meant to be sipped like a flavored drink rather than a traditional protein shake.
• None of them has been personally tested by our team — this comparison is based on published label data and pricing, not hands-on tasting.

Bottom line

You won’t go wrong with any of the three — the differences are real but modest. Pick GHOST if protein-per-serving is what matters most to you, NutraBio if you’re price-sensitive, and Isopure if flavor variety keeps you consistent long-term. If you’re still unsure whether clear whey is the right format at all (versus a regular whey shake), see our Clear Whey vs Regular Whey comparison first.

Sources

• Manufacturer product pages and label data for Isopure Clear Protein, NutraBio Clear Whey Isolate, and GHOST Clear Whey.
• Pricing checked directly from each brand’s official product page at the time of writing; prices change frequently and may not reflect current promotions.