Protein powder is a food. In Great Britain its label may use only claims the national register authorises, such as that protein contributes to the growth and maintenance of muscle mass and to normal bones, and only if the powder is at least a source of protein. Several whey promises, from recovery to fat loss, are recorded as not substantiated.
That is the short answer to whether protein powder is good for you, and it is an evergreen one. This desk read the Department of Health and Social Care’s Great Britain nutrition and health claims register page and its 19 May 2026 spreadsheet, every protein row of it, on 16 October 2026. The page says the register “sets out all authorised and rejected nutrition and health claims”, and that only authorised claims may be used in Great Britain.
Is protein powder good for you, according to the register?
The register does not grade products. It rules on sentences. Four protein health claims carry the status “Authorised for use in Great Britain”, and each may be used only for “food which is at least a source of protein”. That condition is the whole of the paperwork: the claims belong to protein, the nutrient, not to powder as a format.
| Wording on the label | Register status | Condition or reason |
|---|---|---|
| “Source of protein” | Nutrition claim | At least 12% of the food’s energy from protein |
| “High protein” | Nutrition claim | At least 20% of the food’s energy from protein |
| Protein contributes to a growth in muscle mass | Authorised, Regulation (EU) 432/2012 | Food at least a source of protein |
| Protein contributes to the maintenance of muscle mass | Authorised, 432/2012 | As above |
| Protein contributes to the maintenance of normal bones | Authorised, 432/2012 | As above |
| Protein is needed for normal growth and development of bone in children | Authorised, Art. 14(1)(b), Regulation (EC) 983/2009 | As above |
| Taken after resistance exercise, whey protein supports muscle growth | Non-authorised | Not substantiated |
| Combined with resistance exercise, whey protein supports an increase in muscular strength | Non-authorised | Not substantiated |
| Whey protein accelerates recovery from exercise | Non-authorised | Not substantiated |
| Combined with exercise and a hypocaloric diet, whey protein supports your fat loss goals | Non-authorised | Not substantiated |
| Protein supports a satiety feeling and helps to control hunger sensations | Non-authorised | Not substantiated |
| Whey protein improves cognitive performance | Non-authorised | Food not sufficiently characterised |
| Soy protein has been shown to lower/reduce blood cholesterol (heart disease risk claim, paraphrased) | Non-authorised | Not substantiated |
What does “source of protein” mean on a tub?
It is a share of energy, not of weight. A food may call itself a source of protein only where protein provides at least 12% of its energy value, and “high protein” needs at least 20%. The point is that once a powder clears the bar, it may use exactly the same authorised sentences as a tin of fish or a pot of yoghurt that also qualifies.
The children’s bone claim sits under a separate article of the law. It is a claim about protein, not a statement that any powder is suitable for children.
Which whey claims has the register refused?
The refused list is longer than the permitted one. Beyond the rows in the table, the register records as non-authorised lines that whey “can reduce muscle loss when dieting”, that whey hydrolysate “enhances muscle recovery”, that whey “enhances mood and mental well-being”, and a string of fullness and appetite claims. The usual reason given is that “this claimed effect for this food has not been substantiated” on the evidence assessed.
The register’s word is non-authorised. It does not call these claims false; it records that they were assessed and may not be made. The gap between the two lists is the useful part for a shopper: a tub promising recovery, fat loss or a sharper mind is using wording the register has turned down.
Is a protein shake better than food?
The register gives no reason to think so. None of the four authorised protein claims mentions powder, timing around training, or sugar and sweeteners on the same panel. A shake that is a source of protein and a meal that is a source of protein earn identical wording. What a powder offers is convenience, and that is a claim about your kitchen, not your muscles.
This desk has read no product panels for this piece, and names no tubs. The same register drives this site’s creatine effects explainer, its creatine dose post and the creatine format review.
Frequently asked questions
Is protein powder good for you?
It is a food, and the useful answer is what the evidence behind the label supports. Great Britain’s register authorises protein to be described as contributing to the growth and maintenance of muscle mass and to normal bones, for food that is at least a source of protein. It records many whey promises, on recovery, fat loss and fullness, as not substantiated.
Are protein powders bad for your health?
The claims register does not answer that; it rules on what a label may promise, not on safety. What it does show is that several of the strongest marketing lines for whey have been assessed and refused. Anyone with a kidney condition or another health concern should ask a doctor or pharmacist before adding a powder.
Do I need protein shakes?
Nothing in the register’s protein rows says a powder is needed. Its authorised claims are about protein, the nutrient, wherever it comes from, so a meal that is a source of protein qualifies for the same wording as a tub. A shake is one way of getting protein, and the label cannot lawfully claim more for it than for food.
Protein powder is a food, and this piece is about label wording only. Nothing here is medical advice, and the boring tub with the permitted wording is still only as good as the diet it sits in.