BioStacks
Best for
Ingredients (8)
Caffeine Anhydrous
100%Dose
350 mg
Target
100–400 mg
Form
—
Alpha-Glyceryl Phosphoryl Choline
100%Dose
300 mg
Target
100–500 mg
Form
—
Beta-Alanine
100%Dose
3600 mg
Target
3200–6400 mg
Form
—
L-Theanine
100%Dose
350 mg
Target
100–250 mg
Form
—
Potassium
100%Dose
290 mg
Target
99–500 mg
Form
Standard
Nutrition
Calories, macros & sodium.
- Sodium105 mg
Other Ingredients (5)
ErythritolSweetener
Witkowski et al. 2023 (Nature Medicine, PMID 36849732) reported elevated plasma erythritol associated with major adverse cardiovascular events (MACE) in two cohorts (n=4,000+), with in-vitro and ex-vivo evidence of enhanced platelet aggregation. Replication is ongoing; FDA and EFSA have not changed their safety positions, but the signal is real and the additive is purely cosmetic. Better-established concern: GI tolerance — single doses above ~50 g cause osmotic diarrhea. Lower threshold for children.
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.
Silicon DioxideAnti-caking
Fine silica powder used to prevent clumping
Spirulina Extract (Color)Colorant
Natural blue colorant derived from the cyanobacterium Arthrospira platensis (spirulina); the pigment is phycocyanin
Stevia ExtractSweetener
Zero-calorie natural sweetener extracted from the leaves of Stevia rebaudiana
How to Take It
Best taken in the morning
Contains Caffeine, which is stimulating — keep it to the morning. Take it with food — the choline and potassium in it are what makes this kind of product feel nauseating on an empty stomach.
With food
On the label
Mix a serving of this preworkout for women and men with water, swig it down, and get fired up and zeroed in and crush your workout . . . and without the jitters, upset stomach, or post-workout crash.
General guidance based on the ingredients, not a substitute for the label or your doctor.
Price Check
$39.97
Pricier than 70% of 96 choline supplements
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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.