Isopure vs Dymatize ISO100: Which Low Calorie Protein is Best?

In this review, I’m putting two heavyweight contenders in the protein powder arena: Isopure vs Dymatize ISO 100. As a former NFL/CFL athlete and certified personal trainer, I’ve chugged more protein shakes than I can count.

Today, we’re diving deep into these popular whey protein isolates to help you decide which one deserves a spot in your gym bag.

Prefer to watch than read? See my full reviews on YouTube:

In This Review:
Quick Look | Nutritional Value | Taste | Quality & Density | Mixability | Digestibility | Cost Comparison | Third Party Testing | Brand Reputation | Which is Best?

30-Second Rundown:

For those of you short on time, here’s a quick summary:

• Protein Content: It’s a tie! Both offer 25g per serving.
• Taste: Isopure edges out with a 7.75/10 vs Dymatize’s 7.4/10.
• Mixability: Isopure takes the lead with 8.2/10 vs Dymatize’s 7.4/10.
• Protein Density: Isopure is the champ with up to 100% vs Dymatize’s 83%.
• Cost: Dymatize is easier on the wallet at $1.24 per serving vs Isopure’s $2.13.
• Third-Party Testing: Dymatize wins with NSF certification, while Isopure lacks third-party testing.

A Quick Look: Isopure vs Dymatize ISO 100

Now, let’s dive into each category to see how these proteins really stack up.

I tried both chocolate and vanilla Dymatize flavors

Nutritional Breakdown

• Both proteins offer 25g of protein per serving, but Isopure contains fewer calories (100 to 110)) compared to Dymatize ISO 100 (120).
• Isopure’s Zero Carb version has 0g of carbs, while Dymatize ISO 100 contains 2g, making Isopure ideal for low-carb or keto diets.
• Both products are low in fat and sugar, with Isopure containing slightly less of each compared to Dymatize ISO 100.
• Dymatize ISO 100 has less sodium (120mg to 210mg) per serving than Isopure Flavored (240mg), in case you’re monitoring your sodium intake.

Protein Quality and Density

• Both Isopure and Dymatize ISO 100 use high-quality whey protein isolate, known for rapid absorption and an excellent amino acid profile.
• Isopure’s Zero Carb version achieves 100% protein density, while Dymatize ISO 100 reaches 83%, both impressive figures for protein powders.
• These high protein densities make both products ideal for maximizing protein intake while minimizing extra calories from carbs and fats.

Taste Test

• Isopure scored slightly higher in taste tests (7.75/10) compared to Dymatize ISO 100 (7.4/10) for both chocolate and vanilla flavors.
• Isopure’s flavors were smooth and naturally tasty, with rich chocolate and pleasant vanilla varieties that weren’t overly sweet.
• Dymatize ISO 100’s flavors were good, with chocolate reminiscent of a protein milkshake, but the vanilla didn’t quite match Isopure’s quality.
• Taste preferences are subjective, and both brands offer multiple flavors beyond those tested, so individual experiences may vary.

Tasting both Chocolate and Vanilla flavors of Isopure

Mixability and Texture

When it comes to mixability, both proteins perform well, but Isopure has a slight edge. Here’s how I scored each:

• Isopure Low-Carb Flavored, Vanilla: 8/10
• Isopure Low-Carb Flavored, Chocolate, 7.6/10
• Dymatize ISO 100, Vanilla: 7.2/10
• Dymatize ISO 100, Chocolate: 7.6/10

Isopure mixes seamlessly with water or milk, leaving minimal clumps or residue. It creates a smooth, easy-to-drink shake with little effort.

Dymatize ISO 100 also mixes well, but you might find a few small clumps, especially if you’re in a hurry. A few extra seconds of shaking usually solves this issue!

Both proteins mixed into a smooth texture—not too thick or thin. They are both easy to drink and don’t leave a chalky aftertaste, which is a common complaint with some protein powders.

After mixing Chocolate ISO100

Digestibility

Both Isopure and Dymatize ISO 100 digested well. As whey protein isolates, they’re low in lactose, which makes them easier on the stomach compared to whey concentrates.

In my experience, neither caused any significant digestive issues. However, your experience may vary, especially if you have a sensitive stomach or are severely lactose intolerant.

If you’ve had trouble digesting other protein powders in the past, either of these could be a good option to try.

After mixing the “Chocolate Gourmet” flavor of Dymatize ISO100

Cost Comparison:

When it comes to your wallet, there’s a clear difference between these two proteins:

• Dymatize ISO 100: $1.24 per serving
• Isopure: $2.13 per serving

Dymatize ISO 100 is significantly more budget-friendly, costing almost a dollar less per serving. This difference can add up quickly if you’re using protein powder regularly.

However, it’s important to consider what you’re getting for your money. Isopure’s higher price comes with zero carbs and slightly better taste and mixability. Whether that’s worth the extra cost depends on your personal goals, diet restrictions, and budget constraints.

Third-Party Testing and Quality Assurance

When it comes to third-party testing, Dymatize ISO 100 has a clear advantage. It’s NSF Certified for Sport, which means it’s been rigorously tested for banned substances and its label claims have been verified.

Isopure, on the other hand, doesn’t currently have any third-party certifications that I could find. This doesn’t necessarily mean it’s a lower quality product, but it does mean there’s less independent verification of its contents and purity.

If third-party testing is a priority for you, especially if you’re a competitive athlete, Dymatize ISO 100 is the better choice in this regard.

Brand Reputation and History

Both Isopure and Dymatize have solid reputations in the sports nutrition industry.

Isopure, founded in 1984, has a long history of producing high-quality protein powders. They’re known for their commitment to purity and their range of zero-carb options.

Dymatize, established in 1994, has built a strong reputation for science-backed supplements. They’re particularly popular among bodybuilders and strength athletes.

Final Verdict: Isopure or Dymatize ISO100?

Choose Isopure if you:

• Follow a strict low-carb or keto diet
• Prefer a higher protein density
• Don’t mind paying more for a premium product
• Like a slightly better taste and mixability

Choose Dymatize ISO 100 if you:

• Want a more affordable option
• Value third-party testing and certifications
• Need a balance of taste, nutrition, and cost
• Are a competitive athlete concerned about banned substances

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You can buy Isopure on Amazon here. You can buy Dymatize on Amazon here.

The best protein powder is one that fits your needs and is used consistently, alongside a balanced diet and regular exercise!

-Coach Big C