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NutraBio
Stim-Free PRE
Our analysis — editorial take, not from the label
A fully disclosed, no-proprietary-blend label built on a heavy 10 g citrulline dose and a full 3.2 g of beta-alanine, with no stimulants at all.
- Caffeine
- 0 mg
- Citrulline
- 10 g
- Beta-alanine
- 3.2 g
- Servings
- 20
Price tier: Premium · relative cost per full serving across this database
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Available in Blue Razz, Orange Mango Tango, Paradise Punch, Lemon Burst, and Wild Watermelon.
Label verified: July 2026 · View label source
Label data
Per full serving · 20 servings per container · from the manufacturer's panel
| Caffeine | 0 mg |
|---|---|
| L-Citrulline | 10 g |
| Beta-Alanine | 3.2 g |
| Proprietary blend | No |
Primary label source: NutraBio official product page · verified July 2026
Cautions
- Beta-alanine (3.2 g) is likely to cause a harmless skin-tingling sensation.
- Fully disclosed label with no proprietary blends; every dose is printed on the panel.
- The formula was revised recently, so older listings still circulate 8 g citrulline and 2.5 g beta-alanine figures from the previous label.
Formulated for healthy adults — not intended for anyone under 18. Full health & safety notes
Product details
Where this label sits
NutraBio Stim-Free PRE sits in the stim-free tier of the Scoop Sense pre-workout database, which spans 0–400 mg of caffeine per serving. Every active ingredient on the panel is listed with its own dose — nothing is hidden inside a blend total. It runs 20 servings per container at the full labeled serving. Everything on this page comes from the manufacturer's supplement facts panel as of July 2026 — never from the marketing page.
Key ingredients & studied doses
- L-Citrulline · 10 g. Above the 6-8 g range used in most citrulline pump studies.
- Beta-Alanine · 3.2 g. Matches the ~3.2 g/day dose used in beta-alanine endurance research; expect tingles.
Flavors & sweetener
Available in Blue Razz, Orange Mango Tango, Paradise Punch, Lemon Burst, and Wild Watermelon.
Who it's best for
People who train late in the day or want zero caffeine — the effects here come from the non-stimulant ingredients. Derived from the label figures above — not medical advice.
How we log this label
Every entry is built the same way: we read the current supplement facts panel, log each disclosed dose, compare it against the amounts used in published research, flag proprietary blends, and state the cautions plainly. The full methodology explains each step.
This label against the research
How we evaluate labelsEach bar shows the amount commonly used in published human research, and where this label's dose falls against it. Research amounts are context, not a recommendation — they are not doses, and nothing here is medical advice.
-
Citrulline10 g
At or above the studied amount0studied range 6 g–8 g10 g
Studies use about 6 g of pure L-citrulline, or 8 g of citrulline malate — which is about 5.3 g of citrulline at the usual 2:1 ratio, and closer to 4 g if the label is 1:1.
Source: Gough et al., European Journal of Applied Physiology 2021 — “The most commonly employed dose of CM is a single acute 8 g dose”
-
Beta-alanine3.2 g
At or above the studied amount0studied range 3.2 g–6.4 g7 g
Studied as a daily loading protocol of 3.2–6.4 g taken for four weeks or longer. A single serving below that range still counts toward the daily total, but one scoop is not a studied dose on its own.
Source: Rezende et al., Frontiers in Physiology 2020 — “It seems that substantial amounts of BA are required to increase MCarn, with most studies using doses of ~3.2–6.4 g·day−1, for periods ranging from 4 to 24 weeks.”
Common questions about NutraBio Stim-Free PRE
Is NutraBio Stim-Free PRE really caffeine-free?
The label lists 0 mg of caffeine. It is still an active formula — ingredients like L-Citrulline and Beta-Alanine are dosed to have effects — so read the full label rather than treating stim-free as effect-free.
Why does NutraBio Stim-Free PRE make my skin tingle?
The 3.2 g of beta-alanine. The prickling (paresthesia) in the face, neck, and hands is generally considered harmless, is dose-dependent, and fades on its own — typically within about an hour. Most beta-alanine studies use 3.2 g per day.
Does NutraBio Stim-Free PRE disclose every dose?
Yes — the label lists an individual amount for each ingredient, with no proprietary blends. That is what the "label fully disclosed" tag on Scoop Sense means, and it is what lets each dose be compared against the amounts used in published research.