Isopure vs Optimum Nutrition vs Nutranelle Protein Powder: Which Is Right for You?

Isopure, Optimum Nutrition Gold Standard, and Nutranelle deliver the same 24–25g of protein per serving. Isopure and Optimum Nutrition both use artificial sweeteners; Nutranelle does not - one of several formulation differences examined in this guide.

We compared all three products using publicly available label data and aggregated community discussions where available.

Our pick: For women who want clean protein and functional nutrition in a single daily scoop - with no artificial sweeteners and nothing unnecessary added - Nutranelle is our pick.

Here's why.

Quick Reference

 

Prices captured 20 March 2026 from brand and retailer pages. Refresh at time of purchase - protein powder pricing changes frequently.

TLDR: Which One Is Right For You?

Nutranelle is right for you if you want your protein powder to do more than deliver protein - clean plant-based protein from four complementary sources, plus organic greens, adaptogens, and digestive enzymes in a single scoop, with no artificial sweeteners and no non-functional additives beyond natural vanilla flavor.

If you've been buying a protein powder, a greens supplement, and an adaptogen separately, Nutranelle consolidates that into one product at a price point that's competitive with premium plant-based alternatives.

Isopure is right for you if you want a straightforward whey isolate with a high protein-to-serving ratio, you're comfortable with sucralose, and your goal is pure protein delivery without additional functional ingredients. It's a solid choice for buyers in the fitness community who have used it for years and trust the formula.

Optimum Nutrition Gold Standard is right for you if you want a widely trusted whey protein at a competitive price per serving, you don't mind the combination of Ace-K and sucralose, and protein delivery is your primary objective. As the benchmark product in the category, it's unlikely to surprise you - positively or negatively.

How We Chose These Products and These Criteria

These three brands were selected because they represent the most frequently compared options in this category based on search data and buyer research.

We evaluated them across four criteria - ingredient transparency, sweetener profile, what you get per serving, and value per serving - because these are the dimensions women most consistently cite as decision factors when researching protein powder.

We used publicly available label data as our primary source throughout.

Where community sentiment is referenced, it reflects aggregated patterns from fitness and nutrition forums rather than individual opinions. Taste and mixability observations for Isopure and Optimum Nutrition are drawn from community discussion patterns rather than first-hand testing.

Who Each Product Is Actually For

Isopure

Isopure is a whey protein isolate built around one thing: delivering a high protein-to-serving ratio with minimal carbohydrates.

It's a longstanding choice in sports nutrition and fitness communities, widely available through major supplement retailers and online. It's positioned toward serious athletes and gym-goers who want a straightforward, no-carb protein source.

Optimum Nutrition Gold Standard

Arguably the most recognised name in protein powder globally. It uses a blended whey formula - isolate, concentrate, and peptides - and is sold at a competitive price point across virtually every supplement and grocery retailer.

Its appeal is familiarity and accessibility. For buyers who want a well-established brand without a premium price, it's the default choice in the whey category.

Nutranelle

Nutranelle’s Plant-Based Protein Powder is built specifically for women. Founded by Janelle Babka, it's formulated around the principle that a protein powder shouldn't just deliver protein - it should deliver functional nutrition.

Every serving includes a certified organic greens blend, an adaptogen stack, digestive enzymes, and key micronutrients, with no artificial sweeteners and no non-functional additives beyond natural vanilla flavor.

Ingredient Transparency

The ingredient list tells you everything that's in the product beyond the headline macros. For those who care about what they're consuming, this is often the most important filter.

What the label data show

Isopure (Creamy Vanilla) ingredients

Whey protein isolate, vitamin and mineral blend [dicalcium phosphate, potassium chloride, magnesium oxide, ascorbic acid, niacinamide, d-alpha tocopheryl acetate, zinc oxide, silicon dioxide, calcium d-pantothenate, vitamin a acetate, potassium iodide, manganese sulfate, chromium chloride, copper sulfate, pyridoxine hydrochloride, riboflavin, sodium molybdate, sodium selenite, thiamine mononitrate, folic acid, cyanocobalamin], soy lecithin, natural and artificial flavor, salt, sucralose, xanthan gum.

Optimum Nutrition Gold Standard (Vanilla Ice Cream)

Protein Blend (Whey Protein Isolate, Whey Protein Concentrate, Whey Peptides), Lecithin, Acesulfame Potassium, Lactase, Natural and Artificial Flavor, Cellulose Gum, Xanthan Gum, Salt, Sucralose.

Nutranelle (Plant-Based Vanilla)

Organic Greenzest™ Protein (Fava Bean, Mung Bean, Pea and Rice Proteins), Choline Bitartrate, Organic Moringa Leaf Powder, Organic Coconut Milk Powder, Organic Kale Leaf Powder, Organic Broccoli Powder, Organic Ginger Root Powder, Organic Turmeric Root Powder, Organic Spinach Leaf Powder, Organic Spirulina Powder, Organic Blueberry Fruit Powder, Organic Strawberry Fruit Powder, Organic Raspberry Fruit Powder, Organic Beet Root Powder, Organic Ashwagandha Root Powder, Organic Maca Root Powder, Organic Rhodiola Root Powder, Organic Digestive Enzyme Blend (Protease, amylase, lipase, cellulase, lactase), Vitamin D3, Iron, Stevia Leaf Extract, Natural Vanilla Flavor.

A few ingredients worth understanding if you're not familiar with them:

• Xanthan gum (NIH/PubChem) - a polysaccharide used as a stabiliser and thickener in both food products and supplements.

• Soy lecithin - an emulsifier derived from soybeans, commonly used to improve mixability in protein powders. Worth noting if you're avoiding soy.

• Cellulose gum - a plant-derived thickener used as a texture agent.

• Acesulfame potassium (NCBI) - an artificial sweetener approximately 200 times sweeter than sugar, commonly used alongside sucralose.

• Sucralose (NIH/PubChem) - a chlorinated artificial sweetener derived from sugar, widely used in protein powders for calorie-free sweetness.

• Ashwagandha root powder (Examine.com) - an adaptogenic herb with a long history of use in Ayurvedic medicine; studied for its effects on stress response and cortisol.

• Rhodiola root powder (Examine.com) - an adaptogen studied for its role in supporting mental and physical performance under stress.

• Maca root powder (Examine.com) - a Peruvian root vegetable studied for its effects on energy and hormonal balance.

• Moringa leaf powder (NIH) - a nutrient-dense plant source containing vitamins, minerals, and antioxidants.

• Spirulina powder (NIH) - a blue-green algae and concentrated source of plant-based protein, iron, and B vitamins.

• Choline bitartrate - a bioavailable form of choline, an essential nutrient important for brain function, liver health, and - at higher doses - fetal neural development.

What users say about ingredients

Isopure is frequently described in fitness forums as a reliable choice for digestive tolerance, particularly among users who have experienced issues with other whey formulas.

A consistent pattern across Reddit threads suggests it mixes relatively cleanly, though a number of more recent discussions note perceived changes in texture and mixability compared to earlier formulations. Value relative to price is a recurring theme - forum users often compare it unfavourably to Optimum Nutrition on a cost basis.

Optimum Nutrition Gold Standard generates consistently positive community sentiment around taste and mixability. On Amazon, the aggregated "Customers say" section for the Vanilla Ice Cream SKU reflects repeated themes around flavour and texture satisfaction, with muscle recovery mentioned frequently as a perceived benefit.

So, all three products have ingredient lists that are publicly available and worth reading in full. What you're looking for is the ratio of functional to non-functional ingredients - and what the non-protein ingredients are actually doing in the formula.

Sweetener Profile

Sweeteners are one of the most common reasons people switch protein powders - and one of the least clearly communicated differences between products.

The marketing language "no added sugar" covers a wide range of sweetening approaches, from multiple artificial sweeteners to plant-derived alternatives to no sweetener at all.

What the label data show

Isopure uses sucralose as its sole sweetener. Sucralose is a chlorine-containing artificial sweetener derived from sugar. It provides sweetness without calories and is one of the most widely used sweeteners in protein powders.

Optimum Nutrition Gold Standard uses both acesulfame potassium and sucralose. Acesulfame potassium (also called Ace-K) is an artificial sweetener commonly used in combination with other sweeteners to improve flavour profile. Using two artificial sweeteners together is a formulation approach that can mask aftertaste from either sweetener alone - worth understanding if you're trying to reduce your overall artificial sweetener intake.

Nutranelle uses stevia leaf extract. Stevia is a plant-derived sweetener extracted from the leaves of Stevia rebaudiana. It provides sweetness without calories or artificial chemical synthesis. Of the three products here, Nutranelle is the only one that contains no artificial sweeteners.

What users say about sweeteners

In forum discussions, sweetener preferences are highly individual - what reads as pleasant to one buyer reads as artificial or bitter to another.

A recurring theme in discussions about Optimum Nutrition specifically is that the combination of Ace-K and sucralose produces a sweetness that some users describe as "chemical" or "overpowering" over time, while others find it undetectable.

Isopure's sucralose-only approach generates fewer aftertaste complaints in the community discussions reviewed, though individual responses vary.

If avoiding artificial sweeteners entirely is a priority for you, only one of these three products fits that requirement.

What You Get Per Serving

Protein per serving is the number on the front of the bag - but it's only part of what's in the scoop.

The more useful question is what the rest of the serving consists of, and whether it adds functional value or is simply there for texture, stability, or flavour.

What the label data shows

Amino acid completeness

A "complete protein" is one that contains all nine essential amino acids - the ones your body cannot synthesise itself and must obtain from food. According to NIH MedlinePlus, animal proteins are generally complete, while individual plant proteins are often incomplete, meaning they're low in one or more essential amino acids.

The standard solution is to combine plant protein sources - each source compensates for the others' limitations.

Whey protein (used in both Isopure and Optimum Nutrition) is a well-established complete protein. Whey isolate in particular has a documented complete essential amino acid profile with a high leucine content, which is the amino acid most directly associated with muscle protein synthesis.

Nutranelle uses a four-source plant protein blend: fava bean, mung bean, pea, and rice. The rationale for blending is grounded in the amino acid profiles of the individual sources

Research published in PMC (Marti et al.) on fava bean protein isolate shows that while fava bean is relatively rich in lysine - an amino acid that plant proteins often lack - its limiting amino acid is the sulphur-containing amino acid group (methionine and cysteine), which is typical of legumes.

Rice protein, by contrast, tends to be higher in sulphur-containing amino acids. Mung bean protein (NIH PMC) contributes additional amino acid diversity. The multi-source approach addresses the limitations of any single plant protein source, achieving amino acid coverage through complementarity rather than through a single complete source.

Functional ingredients beyond protein

This is where the three products diverge most meaningfully. Isopure includes a vitamin and mineral blend alongside its whey isolate. Optimum Nutrition delivers protein and effectively nothing else beyond texture and flavour agents.

Nutranelle's serving includes, beyond its protein blend: an organic greens complex (kale, broccoli, spinach, spirulina, moringa), a blend of organic antioxidant fruit powders (blueberry, strawberry, raspberry), organic adaptogens (ashwagandha, maca, rhodiola), an organic digestive enzyme blend (protease, amylase, lipase, cellulase, lactase), choline bitartrate, vitamin D3, and iron.

Whether this matters to you depends entirely on what you're looking for a protein powder to do.

If your goal is to supplement a diet that already includes a greens supplement, an adaptogen, and digestive enzyme support, Nutranelle consolidates several products into one scoop.

If your goal is straightforward protein delivery without additional ingredients, either of the whey options serves that purpose more directly.

All three products deliver roughly the same amount of protein per serving. The meaningful difference is what comes with it - and whether the additional ingredients in the formula are functional, or just there to hold it together.

Value Per Serving

Isopure servings derived from package weight (1360g ÷ 31g per serving ≈ 44 servings).

Context on pricing 

A spot-check of mainstream US protein powders captured on 20 Mar 2026 found price per gram of labelled protein ranging from about $0.04/g at the budget end (e.g. Equate whey at $0.038/g) to about $0.10/g for smaller premium plant-based formulations (e.g. Orgain at $0.095/g), with many large-format tubs clustering around $0.05–$0.07/g.

On that spectrum, Nutranelle sits in the upper range - but below Orgain, and comparable on a per-serving basis to Garden of Life Sport Organic Plant-Based Protein at approximately $2.15 per serving.

In forum discussions, Isopure is frequently described as expensive relative to Optimum Nutrition for buyers whose primary goal is protein delivery.

Optimum Nutrition is consistently framed as strong value-for-money in the whey category - it's the benchmark that most forum users use when assessing whether a premium product justifies its price.

Nutranelle costs roughly $0.34 more per serving than the whey options here. Whether that represents good value depends on whether you would otherwise buy a greens supplement, an adaptogen, and digestive enzyme support separately - and what those would cost you individually.

Next Steps

Explore the range and see for yourself why hundreds of women are happy they made the switch to Nutranelle protein powder.

Frequently Asked Questions

Is plant-based protein actually as effective as whey for building muscle?

For most women, it’s close enough that the difference is unlikely to matter in practice. The primary advantage whey has over plant protein is its leucine content and absorption speed - leucine is the amino acid most directly associated with triggering muscle protein synthesis.

Whey isolate delivers leucine quickly and in higher concentrations than plant proteins. However, research on muscle outcomes over weeks and months - rather than acute absorption windows - shows that the gap narrows significantly when total daily protein intake is sufficient.

If you're hitting your daily protein target consistently, the source matters less than the marketing suggests.

Nutranelle uses four plant protein sources - why does that matter?

Individual plant proteins are typically low in one or more essential amino acids.

Fava bean protein, for example, is relatively rich in lysine - an amino acid that many plant proteins lack - but lower in sulphur-containing amino acids like methionine and cysteine. Rice protein tends to be higher in those same sulphur-containing amino acids. 

By combining four sources, Nutranelle's formula achieves amino acid coverage through complementarity - each source compensating for the others' limitations. This is the same principle behind traditional food pairings like rice and beans, applied at a formulation level.

I already take a greens supplement. Does adding Nutranelle mean I'm doubling up?

Potentially, yes - and it's worth checking before you buy. Nutranelle's formula includes organic kale, broccoli, spinach, spirulina, moringa, and a blend of fruit powders, alongside adaptogens like ashwagandha, maca, and rhodiola.

If your current greens supplement contains similar ingredients, you'd be overlapping on those. The question is whether the consolidation makes sense for your routine - one product instead of two - or whether the overlap tips you into more of a given ingredient than you want.

If your greens supplement is a primary product you've specifically chosen for its formula, Nutranelle probably supplements rather than replaces it. If you take greens somewhat casually and would happily consolidate, Nutranelle likely covers the bases.