BioStacks
Best for
Ingredients (9)
L-Leucine
100%Dose/day
7000 mg
Target
2000–5000 mg
Form
—
Potassium
100%Dose/day
400 mg
Target
99–500 mg
Form
—
Sodium
100%Dose/day
440 mg
Target
300–1000 mg
Form
—
L-Isoleucine
100%Dose/day
3500 mg
Target
1500–4000 mg
Form
—
L-Valine
100%Dose/day
3500 mg
Target
1500–4000 mg
Form
—
Nutrition
Calories, macros & sodium.
- Calories0 Calorie(s)
- Total Carbohydrates0 Gram(s)
- Sugar0 Gram(s)
Other Ingredients (5)
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.
Acesulfame PotassiumSweetener
Older NTP rodent studies (1980s, contested) reported lymphoma and leukemia at very high chronic doses; modern reviews (FDA 2003, EFSA 2000) concluded no cancer risk at human exposure levels but the issue is not fully resolved (Mishra 2020 review). Animal evidence suggests gut microbiome disruption (Bian 2017 — male mice on Ace-K showed altered microbiota and metabolic markers). Manufacturing uses methylene chloride, with potential residue concerns. Purely cosmetic additive — risk:benefit unfavorable for supplements.
Natural and Artificial FlavorsFlavor
The 'artificial' component means synthetic chemicals are used, but the exact compounds are proprietary and not disclosed on the label. If you have sensitivities or allergies, you cannot verify what's in it. Products using only natural flavors are more transparent.
Citric AcidAcidulant
Natural acid derived from citrus fruits
FD&C Blue Lake #1 (color)
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
Glutamine 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.
Label directs 2 servings — keep one for the morning
On the label
When to take Xtend for best results: Pre Workout Xtend Energy Intra Workout Xtend Original Post Workout Xtend Pro Combine with any Xtend branded product every day, even on rest days, to help maximize your recovery.
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.