If you're looking for the best bang for your buck when it comes to protein powder on Amazon — especially for muscle building on a budget — this guide breaks it down by price per serving, protein content, and ingredient quality.

🥇 1. Optimum Nutrition Gold Standard 100% Whey

Protein per serving: 24g

Servings per container: ~73 (5 lb tub)

Cost per serving: ~$1.20–$1.40

Why it’s great:

High-quality, fast-absorbing whey isolate blend

Great taste, mixes easily

One of the most trusted brands in fitness

👉 Optimum Nutrition Gold Standard 100% Whey

🥈 2. MyProtein Impact Whey Isolate

(Available via MyProtein Store on Amazon)

Protein per serving: 22g–25g

Cost per serving: Often under $1

Why it’s great:

One of the most affordable isolates

Clean ingredients, low in fat and carbs

Frequently on sale, especially in bundles

👉 MyProtein Impact Whey Isolate

🥉 3. Quest Nutrition Protein Powder

Protein per serving: 22g

Cost per serving: ~$1.20–$1.50

Why it’s great:

Low-carb and keto-friendly

No added sugar

Great for shakes, baking, or protein-rich snacks

👉 Quest Vanilla Milkshake Flavor

💪 Bonus Budget Pick: Body Fortress Whey Protein

Protein per serving: 30g

Cost per serving: ~$0.75–$1

Why it’s great:

Very affordable and widely available

Higher protein per scoop

Some fillers, but solid for everyday budget gains

👉 Body Fortress Whey Protein

📌 Tips for Choosing the Right Protein:

Whey Isolate = fast absorption, great post-workout

Whey Blend (Isolate + Concentrate) = good for anytime of day

Aim for >20g protein per scoop and <150 calories

Choose brands with third-party testing for quality and purity
(e.g., Optimum Nutrition, MyProtein, Dymatize)

💡 Looking to make the most of your protein?
Let me know your fitness goals and I’ll send over a custom shake recipe tailored to your routine and calorie target.