BioStacks
MyProtein

Origin Stim-Free Pre-Workout (Sample)

Powder

MyProtein · £1.99

Best for

Muscle

Ingredients (5)

Beta Alanine

100%

Dose

3500 mg

Target

3200–6400 mg

Form

—

L-Arginine-α-Ketoglutarate

100%

Dose

4000 mg

Target

2000–6000 mg

Form

—

L-Citrulline Malate

100%

Dose

8000 mg

Target

6000–8000 mg

Form

Standard

Choline Bitartrate

100%

Dose

490 mg

Target

100–500 mg

Form

Budget

L-Tyrosine

50%

Dose

250 mg

Target

500–2000 mg

Form

—

Other Ingredients (8)

SucraloseSweetener

Dose context matters. As a trace excipient in a tablet coating or capsule, the amount is minimal and not a meaningful concern. The evidence below applies to the gram-level intakes typical of sweetened protein powders, pre-workouts, and drink mixes: a 2022 human trial (Suez et al., Cell) showed sucralose disrupts gut bacteria and worsens blood sugar control in healthy adults, and a 2023 study (Schiffman et al.) found that sucralose-6-acetate — a compound formed when sucralose is digested — was genotoxic to human cells in vitro. It remains an artificial sweetener with no nutritional purpose.

MaltodextrinBinder

Spikes blood sugar faster than table sugar (glycemic index 85–105). Research links it to gut bacteria changes that may promote intestinal inflammation (Nickerson et al. 2015). Used as a cheap filler — adds nothing beneficial.

Silicon DioxideAnti-caking

Fine silica powder used to prevent clumping

Natural FlavorsFlavor

Broad regulatory category of flavor constituents derived from natural sources. Composition is proprietary and not disclosed — 'Natural Flavors' can include several hundred different compounds depending on the target flavor profile, including hexane-extracted constituents and proprietary carrier solvents. 'Natural' is a regulatory definition (21 CFR §101.22), not a safety guarantee.

Spirulina Extract (Color)Colorant

Natural blue colorant derived from the cyanobacterium Arthrospira platensis (spirulina); the pigment is phycocyanin

Sodium CitrateBuffer

Sodium salt of citric acid used for pH control, tartness, and chelation in gummies

Fatty AcidsCarrier

Fatty acids derived from vegetable triglycerides, used as lipid carriers in enhanced-absorption vitamin formulations

Curcuma Oil Extract

Not reviewed yet

How to Take It

Best taken in the morning

The Tyrosine in it is what pulls this toward the morning. Take it with food — the choline in it is what makes this kind of product feel nauseating on an empty stomach.

With food

Arginine does better on an empty stomach, but something else in this bottle needs food. Taking the whole product with a meal is the better trade — an upset stomach is why most people stop.

Keep it away from protein-heavy meals

On the label

Mix the sachet (20g) with 300-400ml of water and consume 30 minutes before your workout. Consume once daily.

General guidance based on the ingredients, not a substitute for the label or your doctor.

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Sources & Scoring

Nutrient data (RDA, UL, and safety thresholds) sourced from: NIH Office of Dietary Supplements and National Academies Dietary Reference Intakes (DRI).

This is not medical advice. Consult a healthcare provider before making changes to your supplement routine.

The score analyzes what's on the label: ingredient doses vs. clinical ranges, chemical forms, evidence levels, and known interactions. It does not verify label accuracy or test for contaminants — for that, look for third-party certifications like USP or NSF.

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