Rule One R1 Protein Naturally Flavored, front of container

Rule One R1 Protein Naturally Flavored, 1.5lb size, Chocolate flavor

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Rule One R1 Protein Naturally Flavored, 4lb size, Vanilla flavor

Rule One R1 Protein Naturally Flavored, 4lb size, Chocolate flavor

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Rule One R1 Protein Naturally Flavored — 25g Isolate, Stevia Sweetened

8 reviews

Rule One R1 Protein — Naturally Flavored25 grams of protein at 110 calories, from whey isolate and hydrolysed whey isolate only. Sweetened with stevia, no artificial flavours or colours, and Informed Choice certified.This is the same protein as standard R1 Protein with one thing changed — and that change is the entire reason to choose it.What "naturally flavored" actually means hereStandard R1 Protein is sweetened with sucralose and acesulfame potassium, with natural and artificial flavours. This version swaps that for stevia leaf extract with natural flavours only, and no synthetic colours.The protein itself is identical. Same whey isolate and hydrolysate, same 25g, same absence of concentrate, creamers, gums and amino spiking. You are not trading protein quality for the natural sweetener — you are only trading the sweetener.That is a cleaner choice than most "natural" versions in this category, where the natural label often comes with a reformulated and weaker protein base.Honest note: stevia has a distinctive lingering aftertaste that a meaningful share of people detect. If you have tried stevia-sweetened products and disliked them, that will not change here. If artificial sweeteners are what you are avoiding, this is the version to buy.Isolate plus hydrolysate, and no concentrate at allThe protein comes from two sources and both are worth understanding.Whey protein isolate is filtered to a high protein percentage, which strips out most of the fat and lactose. That is why this sits at 25g protein for only 110 calories with single-digit carbs — a genuinely efficient protein-to-calorie ratio.Hydrolysed whey isolate has been partially broken down by enzymes into smaller peptides before you drink it, which speeds absorption. It is more expensive, which is why most products either skip it or include a token amount.What is deliberately absent matters as much. No whey concentrate — the cheaper, lower-protein, higher-lactose fraction most blends rely on. No creamers, no gums, no fillers.And no amino spiking. That is the practice of adding cheap free-form aminos like glycine or taurine to inflate nitrogen-based protein tests without supplying usable complete protein. The full explanation is on our R1 Whey Blend page.Specs Protein25g per scoop Calories~110 Carbohydrate~2g Fat0–1g EAAs12g, including 6g naturally occurring BCAAs SourcesWhey isolate + hydrolysed whey isolate only SweetenerStevia leaf extract Artificial flavours / coloursNone Concentrate, creamers, gums, amino spikingNone CertificationInformed Choice, tested by LGC AllergensMilk, soy (lecithin)12g of EAAs including 6g of BCAAs is the number worth noting. Those are naturally occurring in the whey rather than added — which is precisely the distinction amino spiking exists to blur.Informed Choice certificationRegularly tested for banned substances by LGC, one of the major sports anti-doping laboratories. That makes this usable by tested athletes, which is not true of most proteins on any shelf.Worth knowing if you compete, and worth nothing at all if you do not — but it costs you nothing either way.How to mix it One scoop into 6 to 8 ounces of cold water. Less liquid for a thicker shake. Lecithin is included for instantising, which is why it disperses without clumping. Not a filler — a functional ingredient. Milk or unsweetened almond milk for a richer texture at the cost of extra calories. Good in oats, yoghurt and smoothies, and it bakes acceptably though a blend is better for that. Post-workout or any time. The hydrolysate speeds absorption, which matters most in that window.Naturally Flavored or standard R1 Protein? Naturally FlavoredStandard R1 Protein Protein sourcesIdenticalIdentical Protein per scoop25g25g SweetenerSteviaSucralose + acesulfame K FlavoursNatural onlyNatural and artificial PriceHigherLowerBuy on sweetener preference alone. The protein is the same. If artificial sweeteners do not bother you, the standard version costs less and performs identically.Who this is for Anyone avoiding artificial sweeteners who does not want to compromise on protein quality People who want isolate and hydrolysate with zero concentrate Tested athletes, given Informed Choice certification Anyone cutting — 25g protein for 110 calories is an efficient ratio People who are lactose sensitive, since isolate removes most of itWho this is not forIf you dislike stevia, buy the standard version. Same protein, cheaper, and no stevia aftertaste. That is the honest recommendation.If you want a thick, creamy shake, an isolate is thinner by nature. A whey blend or casein gives you that.If you bake with protein, a blend performs better — pure whey dries baked goods out.If cost per gram is your priority, a concentrate-containing blend is cheaper. You are paying here for isolate, hydrolysate and the natural sweetener.Contains milk and soy lecithin.Stack it with: creatine, which mixes in without affecting flavour. See our creatine range.Frequently asked questionsWhat is the difference from standard R1 Protein?Only the sweetener and flavouring. This version uses stevia with natural flavours; the standard uses sucralose, acesulfame potassium and artificial flavours. The protein is identical in both.What protein does it use?Whey protein isolate and hydrolysed whey protein isolate only — no whey concentrate, creamers, gums or fillers.What does hydrolysed mean?The protein has been partially broken into smaller peptides by enzymes before you drink it, which speeds absorption. It costs more, so most products use little or none.How much protein and how many calories?25g of protein at roughly 110 calories, with about 2g carbs and 0–1g fat. It also supplies 12g of EAAs including 6g of naturally occurring BCAAs.Is it tested for banned substances?Yes, Informed Choice certified and regularly tested by LGC.Does stevia taste different?It has a lingering aftertaste that some people detect and others do not. If you have disliked stevia products before, the standard version is the better buy.Is it good for lactose intolerance?Isolate is filtered to remove most lactose, so it suits most people who react to dairy protein better than a concentrate blend would.Can I bake with it?You can, but pure whey denatures under heat and dries baked goods out. A whey and casein blend is better suited. Read more

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PRODUCT LABEL

Rule One R1 Protein — Naturally Flavored

25 grams of protein at 110 calories, from whey isolate and hydrolysed whey isolate only. Sweetened with stevia, no artificial flavours or colours, and Informed Choice certified.

This is the same protein as standard R1 Protein with one thing changed — and that change is the entire reason to choose it.

What "naturally flavored" actually means here

Standard R1 Protein is sweetened with sucralose and acesulfame potassium, with natural and artificial flavours. This version swaps that for stevia leaf extract with natural flavours only, and no synthetic colours.

The protein itself is identical. Same whey isolate and hydrolysate, same 25g, same absence of concentrate, creamers, gums and amino spiking. You are not trading protein quality for the natural sweetener — you are only trading the sweetener.

That is a cleaner choice than most "natural" versions in this category, where the natural label often comes with a reformulated and weaker protein base.

Honest note: stevia has a distinctive lingering aftertaste that a meaningful share of people detect. If you have tried stevia-sweetened products and disliked them, that will not change here. If artificial sweeteners are what you are avoiding, this is the version to buy.

Isolate plus hydrolysate, and no concentrate at all

The protein comes from two sources and both are worth understanding.

Whey protein isolate is filtered to a high protein percentage, which strips out most of the fat and lactose. That is why this sits at 25g protein for only 110 calories with single-digit carbs — a genuinely efficient protein-to-calorie ratio.

Hydrolysed whey isolate has been partially broken down by enzymes into smaller peptides before you drink it, which speeds absorption. It is more expensive, which is why most products either skip it or include a token amount.

What is deliberately absent matters as much. No whey concentrate — the cheaper, lower-protein, higher-lactose fraction most blends rely on. No creamers, no gums, no fillers.

And no amino spiking. That is the practice of adding cheap free-form aminos like glycine or taurine to inflate nitrogen-based protein tests without supplying usable complete protein. The full explanation is on our R1 Whey Blend page.

Specs

Protein	25g per scoop
Calories	~110
Carbohydrate	~2g
Fat	0–1g
EAAs	12g, including 6g naturally occurring BCAAs
Sources	Whey isolate + hydrolysed whey isolate only
Sweetener	Stevia leaf extract
Artificial flavours / colours	None
Concentrate, creamers, gums, amino spiking	None
Certification	Informed Choice, tested by LGC
Allergens	Milk, soy (lecithin)

12g of EAAs including 6g of BCAAs is the number worth noting. Those are naturally occurring in the whey rather than added — which is precisely the distinction amino spiking exists to blur.

Informed Choice certification

Regularly tested for banned substances by LGC, one of the major sports anti-doping laboratories. That makes this usable by tested athletes, which is not true of most proteins on any shelf.

Worth knowing if you compete, and worth nothing at all if you do not — but it costs you nothing either way.

How to mix it

One scoop into 6 to 8 ounces of cold water. Less liquid for a thicker shake.
Lecithin is included for instantising, which is why it disperses without clumping. Not a filler — a functional ingredient.
Milk or unsweetened almond milk for a richer texture at the cost of extra calories.
Good in oats, yoghurt and smoothies, and it bakes acceptably though a blend is better for that.
Post-workout or any time. The hydrolysate speeds absorption, which matters most in that window.

Naturally Flavored or standard R1 Protein?

	Naturally Flavored	Standard R1 Protein
Protein sources	Identical	Identical
Protein per scoop	25g	25g
Sweetener	Stevia	Sucralose + acesulfame K
Flavours	Natural only	Natural and artificial
Price	Higher	Lower

Buy on sweetener preference alone. The protein is the same. If artificial sweeteners do not bother you, the standard version costs less and performs identically.

Who this is for

Anyone avoiding artificial sweeteners who does not want to compromise on protein quality
People who want isolate and hydrolysate with zero concentrate
Tested athletes, given Informed Choice certification
Anyone cutting — 25g protein for 110 calories is an efficient ratio
People who are lactose sensitive, since isolate removes most of it

Who this is not for

If you dislike stevia, buy the standard version. Same protein, cheaper, and no stevia aftertaste. That is the honest recommendation.

If you want a thick, creamy shake, an isolate is thinner by nature. A whey blend or casein gives you that.

If you bake with protein, a blend performs better — pure whey dries baked goods out.

If cost per gram is your priority, a concentrate-containing blend is cheaper. You are paying here for isolate, hydrolysate and the natural sweetener.

Contains milk and soy lecithin.

Stack it with: creatine, which mixes in without affecting flavour. See our creatine range.

Frequently asked questions

What is the difference from standard R1 Protein?
Only the sweetener and flavouring. This version uses stevia with natural flavours; the standard uses sucralose, acesulfame potassium and artificial flavours. The protein is identical in both.

What protein does it use?
Whey protein isolate and hydrolysed whey protein isolate only — no whey concentrate, creamers, gums or fillers.

What does hydrolysed mean?
The protein has been partially broken into smaller peptides by enzymes before you drink it, which speeds absorption. It costs more, so most products use little or none.

How much protein and how many calories?
25g of protein at roughly 110 calories, with about 2g carbs and 0–1g fat. It also supplies 12g of EAAs including 6g of naturally occurring BCAAs.

Is it tested for banned substances?
Yes, Informed Choice certified and regularly tested by LGC.

Does stevia taste different?
It has a lingering aftertaste that some people detect and others do not. If you have disliked stevia products before, the standard version is the better buy.

Is it good for lactose intolerance?
Isolate is filtered to remove most lactose, so it suits most people who react to dairy protein better than a concentrate blend would.

Can I bake with it?
You can, but pure whey denatures under heat and dries baked goods out. A whey and casein blend is better suited.