GNC AMP Sustained Protein Blend Strawberry Milkshake - 7hr Release

In this review of the GNC AMP Sustained Protein Blend Strawberry Milkshake, the bottom line is clear: this powder suits lifters and busy athletes who want a combination of quick recovery and extended muscle support. The reviewer found the four-source protein formula - native whey isolate, micellar casein, egg whites, and whey hydrolysate - delivers both immediate and sustained amino availability, which is the single biggest reason to buy. It mixes easily in cold water and is intended for morning and pre- or post-workout use.

Key Features

• Four protein sources: Combines native whey isolate, micellar casein, egg whites, and whey hydrolysate to provide a blend of rapid and slow-release proteins for prolonged muscle support.
• Seven-hour sustained release: The formula is designed to supply amino acids over roughly seven hours, helping reduce the need for frequent protein snacks during a busy day.
• Rapid and sustained fuel: Includes fast-release proteins for immediate post-workout recovery plus slow proteins for on-demand muscle support later.
• High BCAA content: Delivers essential branched-chain amino acids to support anabolic muscle maintenance, performance, and recovery.
• Easy mixing: Mixes into 8 fl. oz. of cold water or another beverage with a generally smooth texture and good solubility.
• Gluten-free formulation: Formulated without gluten, making it suitable for those avoiding gluten in their sports nutrition.

Who It's For

GNC AMP Sustained is best for gym-goers, strength athletes, and commuters who want a single powder that covers both immediate post-exercise recovery and longer periods between meals. The sustained-release claim makes it a practical choice for people who cannot eat frequent protein-rich snacks but still want steady amino availability.

Those with sensitive stomachs or who react to mixed protein blends should be cautious, as some customers reported stomach sensitivity or bloating. If you need a purely whey isolate product or follow a restrictive diet that excludes egg-derived proteins, look elsewhere.

Pros & Cons

Pros

• Multi-source blend balances fast and slow proteins for both immediate and extended muscle support.
• Good mixability and generally praised strawberry milkshake flavor that blends well with water.
• Formulation is gluten-free and geared toward performance with essential BCAA delivery.
• Designed to reduce the need for frequent protein snacks by maintaining amino supply for hours.

Cons

• Some users report stomach sensitivity or bloating when using this blended protein formula.
• Instructions recommend not taking close to bedtime, which limits late-evening use.

Specifications

Brand	GNC
Product	AMP Sustained Protein Blend - Strawberry Milkshake
Servings	28 servings
Protein sources	Native whey isolate, micellar casein, egg whites, whey hydrolysate
Sustained release	Up to seven hours
Mixing	Mixes into 8 fl. oz. cold water or other beverage
Dietary note	Gluten-free

Our Verdict

GNC AMP Sustained is a practical, performance-oriented protein for athletes who want immediate recovery plus hours of ongoing muscle support; it offers good mixability and flavor for the price and is strong value for those who tolerate blended proteins. Those with digestive sensitivity or who require a single-source isolate should consider alternatives.

Frequently Asked Questions

How should I use this powder?
Mix one serving in 8 fl. oz. of cold water or beverage in the morning and pre- or post-workout; recommended dosing for max results is two scoops twice daily and avoid taking it close to bedtime.

Is this product gluten-free?
Yes, the formulation is gluten-free according to the product information.

Will this cause bloating?
Some users report stomach sensitivity or bloating with mixed protein blends, so start with a smaller serving to assess tolerance.