Supplement Safety & Interaction Checker
Combining pre-workouts and daily coffee can push total caffeine past general adult reference limits. Review your estimated intake locally and export a summary or printable PDF report.
Supplement Interaction & Safety Checker
Combining pre-workouts and daily coffee can push cumulative caffeine past general adult reference levels or overlap with sleep timing. Select your daily inputs below to review estimated totals locally in your browser.
Select Supplements to Include in Your Check:
Values reflect catalog feature disclosures or category estimates (0 mg for stimulant-free products; 200 mg fallback only when a pre-workout does not specify caffeine).
Assessment Findings & Report Controls
Assessment Date: 2026-10-30 • Runs locally in your browser (nothing is stored or emailed)
Checked Products & Ingredient Amounts Provided
- ApexPulse Endurance Pre-Workout (pre-workout): 200 mg caffeine [Category fallback estimate (200 mg assumed; exact label amount not listed in feature summary)]; 0 g beta-alanine [None listed in catalog feature summary (0 g)]
- NitroStride Stim-Free Runner Formula (pre-workout): 0 mg caffeine [Disclosed stimulant-free (0 mg)]; 0 g beta-alanine [None listed in catalog feature summary (0 g)]
- Daily Coffee / Espresso: 1 cup (~95 mg caffeine estimated at 95 mg per 8 oz cup)
No Threshold Overlaps Detected in Selected Inputs
Based on the selected catalog entries and coffee intake, estimated caffeine and beta-alanine totals remain within general adult reference ranges.
Evidence References Used
- Spilling the Beans: How Much Caffeine is Too Much? (U.S. Food and Drug Administration (FDA)) — Cites 400 mg of caffeine per day as an amount not generally associated with dangerous, negative effects in healthy adults, while noting wide individual sensitivity.
- Caffeine Effects on Sleep Taken 0, 3, or 6 Hours Before Bedtime (Drake et al., Journal of Clinical Sleep Medicine (2013)) — Demonstrates that 400 mg of caffeine taken even 6 hours prior to bedtime significantly disrupts sleep and reduces total sleep duration.
- Dietary Supplements for Exercise and Athletic Performance — Health Professional Fact Sheet (NIH Office of Dietary Supplements (ODS)) — Summarizes published evidence and common acute side effects for ergogenic ingredients including caffeine, creatine, and beta-alanine paresthesia.
Missing Information & Limitations
- Individual health history, pregnancy/lactation status, cardiovascular conditions, and personal stimulant sensitivity are not collected or evaluated.
- Prescription medications, over-the-counter drugs, and botanical interactions are not checked by this tool.
- Caffeine and beta-alanine figures rely on catalog feature summaries (~95 mg per 8 oz cup of coffee) and may differ from your specific product lot, flavor variant, or scoop weight.
- MyFitterU does not perform laboratory testing for ingredient potency, heavy metals, or banned-substance contamination.