# 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

- [Smart Stack Builder Quiz](https://myfitteru.com/quiz)
- [Supplement Timing Clock](https://myfitteru.com/timing)
- [Supplement Safety & Interaction Checker](https://myfitteru.com/safety)
- [Creatine Saturation & Loading Calculator](https://myfitteru.com/creatine)
- [Comprehensive Athlete Protocol Generator](https://myfitteru.com/protocol)
- [Caffeine Tolerance Reset & Taper Calculator](https://myfitteru.com/caffeine-reset)
- [Best Creatine Monohydrate Lab Audit (2026)](https://myfitteru.com/best-creatine-monohydrate)
- [Programmatic Stacking Bundles Hub](https://myfitteru.com/stacks)
  - [Ultimate Hypertrophy & Muscle Growth Stack](https://myfitteru.com/stacks/ultimate-muscle-building-stack)
  - [Stim-Free Endurance & Aerobic Performance Stack](https://myfitteru.com/stacks/stim-free-endurance-running-stack)
  - [Rapid Cutting & Lean Definition Stack](https://myfitteru.com/stacks/rapid-cutting-fat-loss-stack)
  - [Pure Strength & Powerlifting Stack](https://myfitteru.com/stacks/pure-strength-powerlifting-stack)
- [Active Ingredients Directory](https://myfitteru.com/ingredients)
  - [L-Citrulline Malate](https://myfitteru.com/ingredients/l-citrulline-malate): Clinical dose 6,000mg – 8,000mg (2:1 ratio) (Grade A)
  - [Beta-Alanine](https://myfitteru.com/ingredients/beta-alanine): Clinical dose 3,200mg – 6,400mg daily (Grade A)
  - [Native Whey Protein Isolate](https://myfitteru.com/ingredients/native-whey-isolate): Clinical dose 25g – 30g per serving (>2.7g Leucine) (Grade A)
  - [Betaine Anhydrous (Trimethylglycine)](https://myfitteru.com/ingredients/betaine-anhydrous): Clinical dose 2,500mg daily (Grade B+)
  - [Caffeine Anhydrous / Sustained-Release](https://myfitteru.com/ingredients/caffeine-anhydrous): Clinical dose 150mg – 300mg (3–6mg/kg) (Grade A)
  - [Pink Himalayan Rock Salt](https://myfitteru.com/ingredients/pink-himalayan-salt): Clinical dose 300mg – 500mg (Sodium Chloride & Trace Minerals) (Grade B)
- [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 }`