The Complete Guide to Protein Powder Types

TL;DR

• Protein powder is a convenient supplement, not a necessity. Whole food should always come first
• Whey protein is the most researched and cost-effective option for most people
• Casein is best for slow-release protein (before bed)
• Pea protein is the best plant-based alternative for most people
• The “best” protein powder is whichever one you’ll actually use consistently and can digest comfortably
• Track your total protein intake (powder and food combined) with Chowdown to ensure you’re hitting your daily target

Walk into any supplement shop or browse any fitness website and you’ll be confronted with an overwhelming wall of protein powders. Whey isolate, whey concentrate, hydrolysed whey, micellar casein, pea protein, soy protein, rice protein, hemp protein, egg white protein, beef protein, cricket protein (yes, really).

Each one claims to be the best. Most of them cost more than they should. And the marketing makes it nearly impossible to figure out which one, if any, you actually need.

This guide cuts through the noise. Here’s what each type of protein powder actually is, what it’s good for, and whether it’s worth your money.

Do You Even Need Protein Powder?

Let’s start here, because the supplement industry would rather you didn’t ask this question.

Protein powder is a supplement. It supplements your diet. It’s not a replacement for food, and it’s not magic. It’s just protein in a convenient, concentrated form.

You need protein powder if:

• You consistently struggle to hit your protein target through food alone
• You need a quick protein source when you don’t have time to prepare a meal
• You want to add protein to foods like oats, smoothies, or baking

You don’t need protein powder if:

• You can hit your protein target through regular meals
• You’d rather spend the money on actual food
• You’re using it as a meal replacement for every meal (that’s a problem)

For most people aiming for 1.6 to 2.0g of protein per kg bodyweight, whole food can cover it. Protein powder makes it easier, especially for the last 20 to 30g when you’re close to your target but don’t want another chicken breast. Our daily protein needs guide explains exactly how to calculate your target, while our practical protein guide shows you how to reach it through food alone.

Animal-Based Protein Powders

Whey Protein

What it is: A by-product of cheese production, derived from milk. The most popular and most researched protein supplement.

Types of whey:

Whey Concentrate (WPC)

• Protein content: 70-80%
• Contains some lactose and fat
• Cheapest form of whey
• Tastes good (the fat and lactose add flavour)
• May cause digestive issues in lactose-sensitive people
• Best for: Most people. It’s cheap, effective, and tastes decent

Whey Isolate (WPI)

• Protein content: 90%+
• Almost no lactose or fat
• More expensive than concentrate
• Slightly better for people with mild lactose sensitivity
• Thinner texture, less creamy
• Best for: People with mild lactose intolerance, those wanting maximum protein per calorie

Hydrolysed Whey

• Pre-digested (broken into smaller peptides)
• Absorbs fastest of all protein types
• Most expensive
• Often tastes bitter
• Best for: Almost nobody. The absorption speed difference is negligible for practical purposes. Save your money

Whey protein pros:

• Most researched protein source
• Complete amino acid profile
• High in leucine (the amino acid that triggers muscle protein synthesis)
• Generally tastes good
• Cost-effective (especially concentrate)
• Mixes easily

Whey protein cons:

• Not suitable for vegans or those with dairy allergies
• Can cause digestive issues (bloating, gas) in some people
• Quality varies significantly between brands

Casein Protein

What it is: The other protein in milk (whey is ~20% of milk protein, casein is ~80%). Forms a gel in your stomach, leading to much slower digestion and absorption.

Key difference from whey: Casein provides a slow, steady release of amino acids over 6 to 8 hours, while whey provides a rapid spike that peaks within 1 to 2 hours.

Best for:

• A pre-bed shake (slow release feeds muscles overnight)
• Keeping you full between meals (the gel formation is very satiating)
• Making thick protein puddings and “ice cream” (casein’s texture is much thicker than whey)

Not great for:

• Post-workout (you want faster absorption then, whey is better)
• People with dairy allergies or severe lactose intolerance
• Budget-conscious buyers (typically more expensive than whey)

Egg White Protein

What it is: Powdered egg whites. Complete protein with an excellent amino acid profile.

Best for: People who can’t have dairy but aren’t vegan. Allergen-friendly for many people. Virtually no taste, which is either a pro (mixes into anything) or a con (boring on its own).

Downsides: More expensive than whey. Slightly foamy texture when mixed with water. Limited flavour options.

Plant-Based Protein Powders

Pea Protein

What it is: Protein extracted from yellow split peas. The most popular plant-based protein powder.

Pros:

• High protein content (typically 80%+)
• Good amino acid profile (high in lysine, decent leucine)
• Allergen-friendly (no dairy, no soy, no gluten)
• Smooth texture for a plant protein
• Relatively affordable

Cons:

• Low in methionine (pair with rice protein to compensate)
• Can have a slightly earthy taste
• Not as well-researched as whey (but growing evidence supports its effectiveness)

Best for: Vegans and anyone avoiding dairy or soy. Pea protein is the closest plant-based equivalent to whey in terms of effectiveness and cost. If you’re plant-based and prefer whole foods, check out our high-protein vegan meals for food-first options.

Soy Protein

What it is: Protein extracted from soybeans. One of the few complete plant proteins.

Pros:

• Complete amino acid profile
• Well-researched
• Affordable
• Contains isoflavones (may have health benefits)

Cons:

• Soy allergen concerns
• Some people avoid it due to phytoestrogen concerns (though research generally shows these fears are overblown at normal consumption levels)
• Taste can be beany

Best for: People who want a complete plant protein and aren’t concerned about soy. Good value option.

Rice Protein

What it is: Protein extracted from brown rice. Low in lysine but high in methionine, making it complementary to pea protein.

Best used: Blended with pea protein. Many “plant protein blends” use a pea/rice combination to create a more complete amino acid profile. On its own, rice protein is incomplete.

Hemp Protein

What it is: Ground hemp seeds. Lower protein content (about 50%) than other options but comes with omega-3 fatty acids and fibre.

Pros: Whole food source, contains healthy fats and fibre Cons: Low protein per serving, gritty texture, strong earthy taste, expensive per gram of protein

Best for: People who want a less processed, more whole-food supplement. Not ideal if maximising protein per calorie is the goal.

How to Choose the Right One

Decision Tree

1. Can you have dairy?

   • Yes → Whey concentrate is your best default
   • No → Go to step 2

2. Can you have soy?

   • Yes → Soy protein isolate is a solid, affordable option
   • No → Go to step 3

3. Any other allergies?

   • No → Pea protein or pea/rice blend
   • Yes → Egg white protein (if not vegan) or hemp protein

4. What’s your budget?

   • Tight → Whey concentrate or soy protein (cheapest per gram of protein)
   • Flexible → Whatever tastes best and digests well for you

5. When are you taking it?

   • Post-workout or in smoothies → Whey or pea protein
   • Before bed → Casein
   • Mixed into oats/baking → Any (flavour matters most here)

What to Look For (and Avoid) on the Label

Look for:

• Protein per serving of 20g+ (ideally 25g+)
• Short ingredient list (protein source, flavouring, sweetener)
• Third-party tested (Informed Sport, NSF Certified)
• Less than 5g of carbs and fat per serving

Avoid:

• “Proprietary blends” that don’t specify protein amounts
• Excessive added sugar (more than 3g per serving)
• Amino spiking (added cheap amino acids like glycine or taurine to inflate the protein number)
• Outrageous health claims (“burn fat,” “build muscle fast”)

Cost Comparison (UK, Early 2026)

Type	Typical Cost per kg	Protein per Serving	Cost per 25g Protein
Whey Concentrate	£15-25	20-24g	£0.50-0.80
Whey Isolate	£25-40	24-27g	£0.70-1.10
Casein	£25-35	24-26g	£0.70-1.00
Pea Protein	£18-30	20-24g	£0.60-0.90
Soy Protein	£15-25	22-27g	£0.45-0.70
Hemp Protein	£20-35	12-15g	£1.00-1.50
Egg White	£30-45	22-25g	£0.90-1.30

Whey concentrate and soy protein offer the best value. Hemp protein is the worst value per gram of protein. Before investing in protein powder, consider whether high-protein snacks or better meal planning might achieve your goals more affordably.

How to Track Protein Powder in Your Macros

Protein powder should be tracked like any other food. One scoop typically provides 25 to 30g of protein, 1 to 5g of carbs, and 1 to 3g of fat.

Log it in Chowdown by scanning the barcode on the tub or searching for the brand. Most popular protein powders are in the database. If you’re new to tracking, our macro tracker starter kit walks you through the basics. The key is making sure it counts toward your daily protein total, not on top of it.

Remember: the goal is to hit your protein target from all sources combined. If you eat 120g of protein from food and add a 30g shake, your total is 150g. Use our macro calculator to determine your personal targets, then track both food and supplements to see the full picture.

The Bottom Line

Protein powder is a tool, not a requirement. The best type for you depends on your dietary restrictions, budget, and personal preferences.

For most people: whey concentrate. It’s cheap, effective, well-researched, and tastes good.

For plant-based eaters: pea protein or a pea/rice blend. Closest to whey in effectiveness.

For everyone: whole food first, powder second. Track your total intake with Chowdown to see whether you actually need a supplement or whether your diet already covers it.

Don’t overthink it. Pick one, use it when needed, and focus your energy on the things that matter more: total protein intake, overall calorie balance, and consistency.