BioStacks
MyProtein

Pre Workout Shot

gel · 1 shot

MyProtein · £3.99

Best for

Muscle

Ingredients (5)

L-Arginine-α-Ketoglutarate

100%

Dose

2000 mg

Target

2000–6000 mg

Form

—

Vitamin B6

6%

Dose

1.4 mg

Target

25–100 mg

Form

—

Beta_alanine

63%

Dose

2000 mg

Target

3200–6400 mg

Form

—

Vitamin B12

1%

Dose

2.5 mcg

Target

250–5000 mcg

Form

Not listed

L-Citrulline Malate

25%

Dose

1500 mg

Target

6000–8000 mg

Form

Standard

Other Ingredients (7)

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.

Beet ColorColorant

Natural red-pink colorant from dehydrated beets or beet juice; the pigment is betanin

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.

Potassium SorbatePreservative

Natural preservative derived from sorbic acid

Citric AcidAcidulant

Natural acid derived from citrus fruits

Purified WaterSolvent

Water meeting USP specifications used as solvent/vehicle in gummies and liquids

Caffeine Anhydrous

Not reviewed yet

How to Take It

Best taken in the morning

Many people prefer B-vitamins earlier in the day; take with food to avoid nausea.

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.

On the label

Consume 1 shot daily before exercise. Shake before use. High caffeine content ( 200 mg/serving). Not recommended for children or pregnant or breast-feeding women.

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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