Is Jacked Factory Nitrosurge Shred underdosed?

• L-CitrullinePer scoop 2 gStudies 4–5.33 gBelow research doseEvidence: Weak

  Contains 2 g; studies use 4–5.33 g.

• Beta-AlaninePer scoop 1.6 gStudies 3.2–6.4 g/dayBelow research doseEvidence: Strong

  Contains 1.6 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.

• Acetyl L-Carnitine (Acetyl L-Carnitine Hydrochloride)Per scoop 1 gStudies Not setNot gradedEvidence: Not graded

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

• CaffeineLabel: Caffeine AnhydrousPer scoop 180 mgStudies 3–6 mg/kgBelow research doseEvidence: Strong

  Contains 180 mg (2.4 mg/kg at 75 kg); studies use 3–6 mg/kg.

• L-TheaninePer scoop 90 mgStudies 100–200 mgBelow research doseEvidence: Weak

  Contains 90 mg; studies use 100–200 mg.

• TheobrominePer scoop 50 mgStudies Not setNot gradedEvidence: Not graded

  Contains 50 mg. Not graded: there is no peer-reviewed exercise trial, and 100–400 mg did not change mood or alertness in human studies.

• BioPerine (black pepper extract)Label: BioPerine (Black Pepper Fruit Extract)Per scoop 3 mgStudies Not setNot gradedEvidence: Not graded

  Contains 3 mg. Not graded: added to help the body absorb other ingredients; it has no dose of its own to judge.

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-Theanine, 100–200 mg: Owen et al., 2008Payne et al., 2025.
5. Daily caffeine reference, 400 mg: US FDA, Spilling the Beans.
6. Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 334147.

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