# MyFitterU

> Evidence-Based Supplement Comparisons & AI Macro Engine

MyFitterU provides lab-verified fitness supplement comparisons ranked by macro accuracy, ingredient dosages, and net 30-day supply cost, paired with a Mifflin-St Jeor BMR/TDEE macro calculator.

## Supplement Comparison Guides

- [Best Pre-Workout for Running (2026 Lab-Tested Comparison)](https://myfitteru.com/best-pre-workout-for-running): Compare the top endurance pre-workouts for runners based on electrolyte profile, L-citrulline dosage, and caffeine control without heart-rate spikes. — Top Pick: ApexPulse Endurance Pre-Workout ($1.65/serving, $49.50/30-day supply)
- [Best Whey Isolate for Cutting & Lean Muscle Retention](https://myfitteru.com/best-whey-isolate-for-cutting): Discover the highest protein-to-calorie whey isolates with zero fillers, tested for macro accuracy during a caloric deficit. — Top Pick: IsoLean Grass-Fed Whey Isolate ($1.85/serving, $55.50/30-day supply)

## Head-to-Head Supplement Matchups

- [ApexPulse Endurance Pre-Workout vs NitroStride Stim-Free Runner Formula](https://myfitteru.com/vs/apexpulse-endurance-pre-workout-vs-nitrostride-stim-free-runner-formula): Value Winner NitroStride Stim-Free Runner Formula (Saves $6.00/30-day supply)

## Machine-Readable Indexes & Feeds

- [JSON Search Index](https://myfitteru.com/search-index.json)
- [RSS 2.0 Syndication Feed](https://myfitteru.com/rss.xml)
- [XML Sitemap](https://myfitteru.com/sitemap.xml)

## Interactive AI Macro Calculator API

- Endpoint: `POST https://myfitteru.com/api/calculate-macros`
- Payload: `{ "age": number, "weight": number, "gender": "male" | "female", "goal": "cut" | "maintain" | "bulk", "diet": string }`