Protein powder — an evidence-based guide.
If you have stood in front of a wall of tubs reading one label after another — concentrate, isolate, hydrolysed, micellar, clear whey, vegan blend, an "advanced anabolic matrix", a pastel version marketed to women — you have probably come away with less clarity than you arrived with. Every tub is written to sound like the one piece you have been missing, and the front of the label has almost nothing to do with the numbers on the back.
For deeper context, see: What to Eat Before, During, and After Your Workout (No Bro-Science, Promise).
Underneath the question of which one sits a quieter one: whether you need any of them at all. Let me answer that first, because it is the most useful sentence here and no supplement shop will say it. Most people who arrive at a protein powder do not have a protein problem. They have a breakfast problem — protein stacked almost entirely into the evening meal, behind a bread-and-jam morning and a thin, carbohydrate-only lunch. Fix the shape of the day and the tub is often unnecessary. And I am not against powders: they are a convenience food, convenience is a legitimate reason to buy food, and for some people they earn their shelf space.
A Breakfast Problem, Not a Protein Powder Problem
When I go through a client's real week, the pattern is remarkably consistent. Dinner is handsome — chicken, fish, a bean stew, meat and rice. Breakfast is bread and jam. Lunch is a sandwich at a desk, or last night's leftovers in a smaller portion.
That matters because the body does not bank protein for later. Repair draws on what is available across the day, and a reasonable amount at two or three eating occasions does more for you than one large load in the evening. [TK: confirm the per-meal protein amount in grams you use with clients, and the daily range in grams per kilogram of body weight] My guide to how much protein you actually need works through the targets properly.
So before you spend anything, try the free version for a fortnight. Eggs or yoghurt at breakfast instead of jam. Cheese, tinned fish or pulses at lunch. Nuts with the afternoon tea.
For many people that is the whole intervention, and the tub never gets bought. For others it changes nothing, and that is where a shake starts to make sense.
When a Protein Shake Genuinely Earns Its Place
Here is where I recommend one without reservation:
- A high training load, particularly strength work several times a week, where the target is high enough that food alone becomes a logistical problem.
- A small appetite, where a glass of something is manageable and another plate of food is not.
- A packed day — long shifts, hospital work, travel — where the realistic alternative is a station pastry.
- Recovery after surgery or illness, where requirements rise at exactly the moment appetite falls.
- Older adults protecting muscle, where appetite is smaller, meals get lighter, and losing muscle is expensive.
- A plant-based eater with a high target, where pulses and tofu already do a great deal of work and a blend closes the remaining gap.
And here is where it is money for nothing: an averagely active person who eats three meals containing protein, trains two or three times a week, and buys a tub because the internet made them anxious. There it adds cost and no measurable benefit. If that is you, you are allowed to put it back on the shelf.
Reading the Label the Way a Dietitian Reads It
Ignore the front of the tub: that is advertising; the panel on the back is the product.
Find protein per 100 g first, not protein per serving. Protein per serving is the number brands prefer to shout, because the serving is theirs to define and a generous scoop flatters a mediocre powder. Per 100 g is the only figure that compares like with like. [TK: confirm the protein-per-100-g figure you treat as the mark of a decent powder]
Then ask what occupies the rest of the grams. What is worth noticing:
- Added sugars, listed under carbohydrate "of which sugars", and common in cheaper flavoured tubs.
- Bulking fillers such as maltodextrin, which are cheap carbohydrate sold at protein prices.
- A long proprietary blend of individual amino acids, usually the ones already abundant in the protein itself. That is a marketing decision rather than a nutritional one.
Flavour and sweeteners decide whether the purchase was worthwhile. A chalky or over-sweet powder reaches the back of a cupboard within a fortnight, and a tub you do not enjoy is wasted money. Buy the smallest size first, and judge it on whether you would willingly drink it on a tired Wednesday — with water, with milk, or in yoghurt.
Whey, Casein and the Plant Blends: An Honest Comparison
Whey and casein are both milk proteins, separated in cheesemaking. Whey concentrate is the least processed and the cheapest, and for most people it is the sensible default. Isolate is filtered further, which raises the protein proportion and strips most of the lactose and fat; that extra cost buys something real only if lactose troubles you.
Casein digests more slowly and sets thick, which makes it a pleasant pudding-like evening option and unremarkable otherwise. The slow-release marketing around it outruns the evidence.
Plant blends — pea, rice, soya, hemp, sometimes fava — work perfectly well when the blend is sensible. I want to be direct about the amino-acid argument used to dismiss them, because it is largely overstated. Individual plant proteins can be lower in one or two amino acids, which is why a good product combines two or three sources rather than leaning on one. Across a varied day that difference is small enough to stop being worth worrying about. My plant-based eating guide sets out the wider picture.
Digestive comfort is the commonest real reason people switch. Bloating, wind and loose stools after a whey concentrate shake are usually about lactose, and moving to an isolate or a plant blend resolves it more often than not. Plant blends have their own quirks: pea protein is earthy, rice protein can feel gritty. None of it appears on the label; it appears in the first week.
Cost Per Serving: Protein Powder Against Your Fridge
This is the section I most want you to keep. Work it out per gram of protein rather than per tub, because the tub price tells you almost nothing. Divide the price by the grams of protein in the container, then compare with your kitchen. [TK: confirm current per-serving protein costs for powder, eggs, yoghurt, cheese, pulses, tinned fish and milk in euros and lira]
Run honestly, it puts things in an order most people find surprising:
- Eggs, milk, dried pulses and tinned fish — usually the cheapest protein available to you, by a clear distance.
- Yoghurt, süzme yoğurt (strained yoghurt) and white cheese — close behind, and they bring calcium and a food you can build a meal around.
- A bulk whey concentrate — often lands near cheese, which is fine value for what it does.
- Ready-to-drink shakes and protein bars — almost without exception, the most expensive protein in the shop.
What the calculation cannot capture is what you are really paying for, which is time. A shake is thirty seconds and no washing up; lentils are cheaper and need a pan, an hour and a plan. Choosing convenience knowingly is reasonable — being sold it as a physiological advantage is what I object to.
A Sample Day Where a Shake Fits, and Where It Is Not Needed
Here is how this looks on an ordinary day with a hard training session. This is illustrative rather than a prescription, and portions belong to you. [TK: confirm the portion sizes and protein amounts you would attach to each of these meals]
- Breakfast: eggs with wholegrain bread, white cheese, tomato and cucumber — or yoghurt with fruit, walnuts and seeds.
- Lunch: lentil soup, a salad dressed in olive oil, bread, and some cheese or tinned fish.
- After training: a shake with milk, because the gym is forty minutes from your kitchen and dinner is two hours away.
- Dinner: baked fish or a chicken and bean stew with bulgur and a generous plate of vegetables in olive oil.
Notice that the shake does one specific job: filling a gap created by geography and timing. Take the training session out of the day and breakfast, lunch and dinner do not change, nothing is missing, and the shake has no job to do — so it does not appear. That is the whole test.
Quality, Regulation and Who Should Check With a Doctor First
Now the part the aisle does not advertise. Supplements are regulated considerably less tightly than food, and what is printed on a label is not independently verified before the tub reaches a shelf. The practical answer is third-party testing, where an outside laboratory checks that the contents match the claim and screens for contaminants. [TK: confirm which third-party testing schemes you recommend by name] For competing athletes that is not optional: contamination with a banned substance is a documented route to a failed test.
Two other things to watch. "Proprietary blend" is a legal way of listing ingredients without saying how much of each is present, so the impressive-sounding ones may be there in traces only. And tubs sold for weight gain or "mass" routinely carry what the buyer did not intend to purchase — added sugar and maltodextrin in quantity, herbal extracts, and in some products stimulants on top of your usual coffee. As a phytotherapy-trained dietitian I am not against plants as medicine; I am against taking them blind, in an unstated quantity, inside a protein tub. My guide to which supplements are worth taking applies the same filter.
Some people should speak to a doctor before starting a protein supplement at all, and kidney disease comes first. In reduced kidney function, protein intake is a clinical variable your medical team sets deliberately, and a concentrated supplement is not a neutral purchase — my guide to eating with chronic kidney disease explains why those targets are individual. [TK: confirm how you want the kidney-function caution phrased, and the threshold at which it applies] Pregnancy is a second conversation, because added ingredients are harder to vet. So is taking several products at once, where nobody adds up the combined load. Nutrition here works alongside, and never replaces, your doctor.
One separate note: creatine is not a protein and does not belong in this comparison. My creatine guide covers it on its own terms.
Common Protein Powder Myths
"You have to get a shake in within thirty minutes of training or you have wasted the session."
The window is far wider and more forgiving than this, and total intake across the day matters more than the clock. If you train fasted first thing, eating reasonably soon afterwards makes sense. Otherwise dinner is fine. My guide to muscle-building nutrition goes through timing properly.
"Plant protein cannot build muscle."
This one is stubborn and the evidence does not support it. A sensibly combined plant blend supports muscle repair and growth when total daily intake is adequate — which was the variable doing the work all along.
"Protein powder damages your kidneys."
This deserves a careful answer rather than a reassuring one. In people with healthy kidneys there is no good evidence that higher protein intakes cause kidney damage, and the claim has long outlived its support. If kidney disease is already present the situation is genuinely different: protein intake is then something your renal team sets to your own results, and a supplement should not be added without that conversation.
"Women need a special women's protein."
There is no physiological basis for one. The pastel tubs usually hold the same whey or pea protein, a smaller scoop, a few added vitamins and a higher price per gram. The tub does not need a gender.
"More protein is always better."
Protein has a point past which extra is simply expensive, displacing vegetables, pulses and fibre. Beyond your requirement those grams build nothing. [TK: clinical observation — what you typically see in clients arriving with two or three tubs already in the cupboard]
Working With Hanzi Nutrition
I am a dietitian, and my honest position on protein powder is this: it is a decent convenience food wrapped in claims it cannot support, and which tub you buy matters far less than what your breakfast and lunch look like. Sort the shape of the day out first. If a shake still has a job after that, buy one knowingly and stop paying for the front of the label.
At Hanzi Nutrition, I work fully online with clients across the Netherlands, Belgium, Germany and Turkey, in English and Turkish, and training nutrition is among the areas I support most often through my sports nutrition service. We begin with a first consultation that maps your real week — your training load, your work pattern, your appetite, what breakfast and lunch actually contain, and every tub in the cupboard. From there I build a personalised plan around your culture, your usual foods, your budget and your schedule, and if that plan includes a powder I will tell you which kind and why — and if it does not, I will say so. Where kidney function, pregnancy or medication is part of the picture, nutrition works alongside your doctor and never replaces that care.
Standing in front of a wall of tubs and unsure whether you need any of them? Contact Hanzi Nutrition for a personalised nutrition plan that works out your real protein needs first and treats supplements as optional extras.
Hanzi Nutrition offers dietitian-led nutrition counselling across the Netherlands, Belgium, Germany, and Turkey, fully online, in English and Turkish. This article is general education and not a substitute for individual medical care — if you have reduced kidney function, are pregnant, or take regular medication, a protein supplement should be discussed with your doctor before you start it. Please coordinate any changes to your nutrition, supplements, or treatment with your doctor.
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