Starting out in the gym is exciting, but the supplement aisle can be overwhelming. Dozens of brands, confusing labels, and more types of protein than you thought possible. If you're new to it all, the good news is that getting started with protein powder doesn't have to be complicated.

At Buffalo Nutrition — North West London's top-rated supplement store — we guide beginners through this every single day. Here's everything you need to know before buying your first tub of protein.

Do Beginners Actually Need Protein Powder?

Short answer: no, but it helps. You can build muscle on food alone if your diet is dialled in. But most people — especially those new to training — don't hit their daily protein targets through food. Protein powder is a convenient, cost-effective way to close that gap.

A general target for muscle building is 1.6–2.2g of protein per kilogram of bodyweight per day. For an 80kg person, that's 128–176g of protein daily. Getting that through chicken, eggs, and Greek yoghurt is possible, but a shake or two makes it a lot easier.

What Type of Protein Should a Beginner Buy?

Whey Protein Concentrate

This is the classic, and for good reason. Whey concentrate is derived from milk, digests quickly, and is ideal post-workout. It typically contains 70–80% protein by weight, with a small amount of carbohydrates and fat that actually help with flavour.

Best for: Most beginners. Affordable, effective, and widely available.

Whey Protein Isolate

A more refined version of whey — typically 90%+ protein, lower in fat and lactose. It costs more but is a good choice if you're lactose-sensitive or cutting calories.

Best for: Those who struggle with dairy digestion, or who want fewer calories per shake.

Casein Protein

A slow-digesting milk protein, often taken before bed to support overnight muscle recovery. Less essential for beginners but worth knowing about.

Best for: Before bed, or as a meal replacement when you need something that keeps you full.

Vegan Protein

Plant-based blends (usually pea + rice protein) that match whey for muscle building when combined correctly. An essential choice if you're dairy-free or vegan.

Best for: Vegans, those with dairy allergies, or anyone who prefers plant-based nutrition.

Our Top Picks for Beginner Protein Powders in 2026

1. Applied Nutrition Critical Whey

The top-selling protein at our London store, and one of the best value-for-money options on the market. Critical Whey delivers around 25g of protein per serving from a whey concentrate and isolate blend, at a price point that doesn't punish beginners for experimenting. The flavours — particularly Chocolate Caramel and Strawberry — are genuinely good.

Protein per serving: ~25g
Best for: Beginners wanting a reliable, great-tasting everyday whey
Verdict: Our number one recommendation for anyone starting out.

2. Optimum Nutrition Gold Standard Whey

The world's best-selling protein powder, and there's a reason it's been at the top for over 20 years. Gold Standard uses a whey isolate as the primary source, mixes cleanly, and comes in over 20 flavours. Slightly pricier than some alternatives but the quality is consistent.

Protein per serving: 24g
Best for: Beginners who want a proven, globally trusted brand
Verdict: You can't go wrong. The benchmark all other wheys are measured against.

3. USN Blue Lab Whey

USN is a well-established UK brand with strong quality control. Blue Lab Whey is well-dosed, digests smoothly, and is available in a wide range of sizes — including smaller starter tubs if you want to try before committing to a big purchase.

Protein per serving: 25g
Best for: Those who want a UK brand with a strong retail presence
Verdict: Solid all-round choice, particularly if you're buying in store.

4. Vegan Option: Applied Nutrition Plant Protein

A pea and rice protein blend that stacks up impressively well against whey for muscle building. Great flavours (the Chocolate Peanut Butter is excellent) and fully plant-based. One of the most palatable vegan proteins we stock.

Protein per serving: 22g
Best for: Vegans, or anyone who wants to reduce dairy intake
Verdict: The best vegan protein for beginners we've found so far.

Protein Powder FAQ for Beginners

When should I take protein powder?
Post-workout is the traditional window, but total daily intake matters more than timing. Take it whenever it fits your routine — morning, after training, or before bed.

How many shakes a day should I have?
One to two servings is plenty for most people. Protein powder should supplement your diet, not replace whole food meals.

Can I mix protein powder with water or milk?
Both work. Milk adds extra protein and calories and usually improves the taste. Water keeps it lower calorie. Try both and see which you prefer.

Will protein powder make me bulky?
No. Protein supports muscle repair and growth, but gaining significant size requires consistent heavy training and a calorie surplus over a long period. A protein shake won't do that on its own.

How do I know how much protein I need?
A good starting point is 1.6g per kilogram of bodyweight. Our in-store team are happy to help you work this out for your specific goals.

Where to Buy Protein Powder in London

Browse our full protein range online at buffalonutrition.co.uk with free delivery on orders over £50. Or come and see us in store — we're happy to let you smell and taste test before you commit to a full tub.

Buffalo Nutrition
132 Cricklewood Broadway
London NW2 3EE
Open 7 days a week

Rated 4.9★ on Google — North West London's most trusted supplement store.