Is Just Ingredients PreWorkout underdosed?

• L-CitrullineLabel: Citrulline MalatePer scoop 5 g, as printedStudies 4–5.33 gNot gradedEvidence: Weak

  Listed as “Citrulline Malate”, a form we have no conversion for, so it isn't graded.

  We're checking this amount against the label: the source prints it in an unusual unit.

• Beta-AlanineLabel: Beta AlaninePer scoop 2.5 gStudies 3.2–6.4 g/dayBelow research doseEvidence: Strong

  Contains 2.5 g; studies use 3.2–6.4 g/day. Beta-Alanine works through daily use over weeks; a lower amount still builds up, just more slowly.

  We're checking this amount against the label: the source prints it in an unusual unit.

• L-LeucineLabel: L-leucinePer scoop 1 gStudies 2–3 gBelow research doseEvidence: Moderate

  Contains 1 g; studies use 2–3 g.

  We're checking this amount against the label: the source prints it in an unusual unit.

• L-IsoleucineLabel: L-isoleucinePer scoop 500 mgStudies Not setNot gradedEvidence: Not graded

  Contains 500 mg. Not graded: no agreed dose of isoleucine on its own. We compare it with the WHO adult requirement pattern: a 10 g dose of essential amino acids in that pattern holds about 1.09 g.

  We're checking this amount against the label: the source prints it in an unusual unit.

• L-ValineLabel: L-valinePer scoop 500 mgStudies Not setNot gradedEvidence: Not graded

  Contains 500 mg. Not graded: no agreed dose of valine on its own. We compare it with the WHO adult requirement pattern: a 10 g dose of essential amino acids in that pattern holds about 1.41 g.

  We're checking this amount against the label: the source prints it in an unusual unit.

• CaffeinePer scoop 150 mgStudies 3–6 mg/kgBelow research doseEvidence: Strong

  Contains 150 mg (2 mg/kg at 75 kg); studies use 3–6 mg/kg.

  We're checking this amount against the label: the source prints it in an unusual unit.

• TaurinePer scoop 100 mgStudies 1–6 gBelow research doseEvidence: Moderate

  Contains 100 mg; studies use 1–6 g.

  We're checking this amount against the label: the source prints it in an unusual unit.

• Panax Ginseng Extract (Root)Per scoop 10 mgStudies Not setNot gradedEvidence: Not graded

  Not graded: we have no research dose for it from exercise studies.

  We're checking this amount against the label: the source prints it in an unusual unit.

• Organic Maca Root PowderPer scoop 10 mgStudies Not setNot gradedEvidence: Not graded

  Not graded: we have no research dose for it from exercise studies.

  We're checking this amount against the label: the source prints it in an unusual unit.

Use “Check it for your dose” to see this table for your own scoops and bodyweight. Only caffeine is dosed per kilogram in the studies we cite; the other research doses are fixed amounts, so your weight doesn't change them.

How many scoops would it take?

To reach the low end of the research dose for each underdosed ingredient.

Taking more doesn't fix this product. Reaching those doses means more than 400 mg of caffeine from the scoops alone, above the FDA's 400 mg daily reference for most adults, before any coffee.

Where the reference doses come from

1. Beta-Alanine, 3.2–6.4 g/day: Harris et al., 2006Hobson et al., 2012Trexler et al., 2015.
2. Caffeine, 3–6 mg/kg: Guest et al., 2021.
3. L-Citrulline, 4–5.33 g: Gough et al., 2021Vårvik et al., 2021.
4. L-Leucine, 2–3 g: Jäger et al., 2017Kerksick et al., 2018.
5. Taurine, 1–6 g: Deng et al., 2025Waldron et al., 2018.
6. Daily caffeine reference, 400 mg: US FDA, Spilling the Beans.

Methodology 1.11. Read the full methodology or the corrections log.