---
product_id: 13917761
title: "FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets"
price: "FREE"
currency: EUR
in_stock: false
reviews_count: 8
url: https://www.desertcart.pt/products/13917761-flex-pre-workout-muscle-builder-nitric-oxide-booster-60-tablets
store_origin: PT
region: Portugal
---

# FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets

**Price:** FREE
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/13917761-flex-pre-workout-muscle-builder-nitric-oxide-booster-60-tablets)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description



## Images

![FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets - Image 1](https://m.media-amazon.com/images/I/81zpSIw38SL.jpg)
![FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets - Image 2](https://m.media-amazon.com/images/I/81AhxeyB28L.jpg)
![FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets - Image 3](https://m.media-amazon.com/images/I/81mKXI5LniL.jpg)
![FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets - Image 4](https://m.media-amazon.com/images/I/31COvUptCGL.jpg)
![FLEX Pre-Workout Muscle Builder - Nitric Oxide Booster - 60 Tablets - Image 5](https://m.media-amazon.com/images/I/71Zn+PvSzuL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    I was recommended Flex by a client and WOW
  

*by N***S on Reviewed in the United States on October 11, 2016*

As a fitness instructor,  I've tried many pre-workout NO2 products over the years and this one if by far one of my favorites! I was recommended Flex by a client and WOW. It gives me just the right amount of an energy boost that I need and helps build strength/endurance. I crush my spin classes twice as hard whenever I have taken Flex. The results are awesome, and muscle growth is inevitable. This is my second bottle and I will purchase again.

### ⭐⭐⭐⭐⭐ 







  
  
    The PUMP Is Real
  

*by J***N on Reviewed in the United States on March 11, 2015*

Based on my experience with Gym Junkies BUILD whey powder, I was anxious to see how the muscle builder supplement would be. I was not surprised to find a clean, short list of ingredients. The real treat was in my biceps though. I have honestly never felt a pump like I did after my first workout with Flex. It really gave me the feeling that I was getting MORE out of the same workout. To me, that's how supplements should work, so I will continue to use Flex!

### ⭐⭐⭐⭐⭐ 







  
  
    ... FLEX a month ago and so far it's delivered better results than the other 3 muscle builders I've tried
  

*by M***E on Reviewed in the United States on October 6, 2014*

I started taking FLEX a month ago and so far it's delivered better results than the other 3 muscle builders I've tried. I feel stronger when I lift, and my stamina has gone way up. I work out for about 45 minutes to 1 hour 5 days a week. Before taking flex my muscles would fatigue at the 30-35 minute mark. When I'm on it, I last about an extra 15-25 minutes. Overall great muscle product.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.pt/products/13917761-flex-pre-workout-muscle-builder-nitric-oxide-booster-60-tablets](https://www.desertcart.pt/products/13917761-flex-pre-workout-muscle-builder-nitric-oxide-booster-60-tablets)

---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-04-23*