Informational only. FDA's 400 mg/day figure applies to healthy adults, not to pregnancy, children, teens, or people with heart conditions or caffeine-interacting medications.
Caffeine per serving

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Transparent Labs · pre-workout

Bulk Black Pre-Workout

mg per serving (as stated)
275 mg
Share of FDA's 400 mg healthy-adult figure
68.8% of 400 mg
Serving as stated on page
Each scoop

Product note: Page suggests beginners start with 1/2 scoop; 275 mg is the per-scoop figure.

Percentages compare one stated product amount with the FDA's 400 mg/day figure for healthy adults. They are arithmetic comparisons, not consumption targets, and do not apply to people who are pregnant or breastfeeding, children, teens, or people with heart conditions or caffeine-interacting medications. Serving wording and product notes qualify the stated amounts; a missing serving size is not inferred.

Manufacturer evidence

Caffeine | 275 mg

Transparent Labs product page · Retrieved

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