---
product_id: 306749193
title: "AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds"
brand: "gnc"
price: "$348"
currency: NZD
in_stock: true
reviews_count: 8
category: "Gnc"
url: https://www.desertcart.nz/products/306749193-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder-improves
store_origin: NZ
region: New Zealand
---

# Clinically proven strength boost 50g Protein per serving 780 Calories fuel AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds

**Brand:** gnc
**Price:** $348
**Availability:** ✅ In Stock

## Summary

> 💥 Bulk smarter, train harder, and own your gains with AMP Mass XXX!

## Quick Answers

- **What is this?** AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds by gnc
- **How much does it cost?** $348 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/306749193-amp-mass-xxx-clinically-proven-weight-gainer-protein-powder-improves)

## Best For

- gnc enthusiasts

## Why This Product

- Trusted gnc brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Delicious Chocolate Boost:** Rich chocolate flavor that mixes smoothly, making your daily shake a treat, not a chore.
- • **Power-Packed Protein Punch:** 50g of high-quality protein fuels muscle growth and recovery with every serving.
- • **Calorie-Rich Fuel for Gains:** 780 calories per scoop to supercharge your mass-building journey without extra meals.
- • **Clean & Tested for Athletes:** Screened against 220+ banned substances, ensuring safe, competition-ready supplementation.
- • **Clinically Proven Performance:** MyoTOR and BETAPOWER blend accelerates strength and stamina gains in just 2 weeks.

## Overview

AMP Mass XXX is a clinically proven weight gainer protein powder delivering 780 calories and 50g of protein per serving. Featuring advanced ingredients like MyoTOR, creatine, and BETAPOWER, it accelerates muscle strength and endurance improvements within 2 weeks. Tested against over 220 banned substances, this 6-pound chocolate-flavored formula supports serious mass gain with clean, science-backed nutrition.

## Description

Buy GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds on desertcart.com ✓ FREE SHIPPING on qualified orders

Review: Great supplement - This is a great way for me to start my day. Extra protein and carbs to kick off a fulfilled day of work. Taste good and goes down well with milk and helps me keep on weight
Review: Cheaper than the store - Works really well

## Features

- Clinically Proven Gainer: Mass XXX mass gainer combines high-quality protein powder, key nutrients, and science-backed innovations—including MyoTOR, creatine, and BETAPOWER—to fuel proven results and performance
- Increase Mass with 40% Fewer Sets: Delivers 50g of protein, including naturally occurring EAAs, plus carbs, and healthy fats—and it’s clinically proven to help get better results out of workouts
- Improve Muscle Strength in As Early as 2 Weeks: MyoTOR is clinically proven to accelerate improvements in strength with as little as 2 weeks of training and included in every serving of Mass XXX mass gainer
- Improve Stamina: Take resistance training to a new limit with MyoTOR’s clinically studied support for improved muscle endurance and BETAPOWER’s athletic performance benefits
- Banned Substance Tested: Product was tested and monitored for over 220 banned substances on the 2020 World Anti-Doping Agency (WADA) Prohibited list via LGC skip lot testing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B091D261TY |
| Best Sellers Rank | #38,872 in Health & Household ( See Top 100 in Health & Household ) #24 in Sports Nutrition Weight Gainers |
| Customer Reviews | 4.6 4.6 out of 5 stars (553) |
| Date First Available  | November 28, 2020 |
| Manufacturer  | GNC |
| Product Dimensions  | 1 x 8 x 10.42 inches; 6.81 Pounds |

## Product Details

- **Brand:** GNC
- **Flavor:** Chocolate
- **Item Weight:** 6.8 Pounds
- **Product Benefits:** Supports overall health and wellness
- **Servings per Container:** 13.0

## Images

![AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds - Image 1](https://m.media-amazon.com/images/I/71N5WqNv6NL.jpg)

## Available Options

This product comes in different **Flavor** options.

## Questions & Answers

**Q: Does it help you gain weight  ?**
A: it helps a little.  cant rely on it. food helps more obviously.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great supplement
*by M***T on October 20, 2025*

This is a great way for me to start my day. Extra protein and carbs to kick off a fulfilled day of work. Taste good and goes down well with milk and helps me keep on weight

### ⭐⭐⭐⭐⭐ Cheaper than the store
*by E***N on November 5, 2025*

Works really well

### ⭐⭐⭐⭐⭐ Protein shake
*by M***X on April 13, 2025*

Great product. Started seeing results in 3 weeks. Does have a lot of calories. Everything you need to bulk up fast.

## Frequently Bought Together

- GNC AMP Mass XXX, Clinically Proven Weight Gainer Protein Powder, Improves Strength and Size, 780 Calories, 50g Protein, Micronized Amino Acids, Creatine, Betaine, Chocolate, 13 Servings, 6 Pounds
- Optimum Nutrition Micronized Creatine Monohydrate Powder, Unflavored, 120 Servings, 600 Grams (Packaging May Vary)
- Optimum Nutrition Gold Standard 100% Whey Protein Powder, Double Rich Chocolate, 5 Pound (Packaging May Vary)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-14*