Creatine vs Protein Powder: Do You Need Both?

Creatine and protein powder are two nutrients with two different jobs, and neither replaces the other. Creatine's authorised wording is about performance in short, high-intensity bursts at 3 g a day; protein's wordings are about the growth and maintenance of muscle mass. They mix in one shake; which you need depends on your goal and your meals.

Evidence at a glance

• Creatine is made in the liver and kidneys from amino acids and carries no protein of its own; the body needs about 1 to 3 g a day, roughly half of it from meat and fish.³
• In 12 men, four 5 g doses of creatine taken with 50 g of protein and 47 g of carbohydrate were retained about 25% better than with 5 g of carbohydrate, and the effect faded within the first 24 hours.⁵
• Creatine alone, 14 double-blind trials: mean sprint power up (standardised difference 0.61).⁷ Protein alone, 49 trials in 1,863 adults: one-repetition maximum up 2.49 kg, fat-free mass up 0.30 kg.⁹
• Whey plus creatine against whey alone: two trials in men, 6 and 11 weeks.^{10, 11}
• Not tested: creatine plus protein against either alone in women, in adults over 60, or for longer than 11 weeks.

Sources checked on 11 November 2026.

Creatine vs protein powder: what is the difference?

Protein is the amino acids your body uses to build and repair every tissue, including muscle. The GB register of nutrition and health claims authorises three wordings for it, "Protein contributes to a growth in muscle mass", "Protein contributes to the maintenance of muscle mass" and "Protein contributes to the maintenance of normal bones", each usable only on a food that is at least a source of protein, which in the register's own terms means protein supplies at least 12% of the food's energy.¹

Creatine is a small compound that muscle stores and draws on for maximal efforts lasting seconds, which is why the register's wording for it is "Creatine increases physical performance in successive bursts of short-term, high intensity exercise", authorised only where a food gives a daily intake of 3 g (grams) of creatine and is aimed at adults doing high-intensity exercise.² One is a building material needed every day in tens of grams; the other is a performance ingredient taken in single grams, and the full picture of what creatine does is on the hub page.

Does creatine have protein in it?

No. Creatine is not a protein. The International Society of Sports Nutrition's position stand describes it as "a naturally occurring non-protein amino acid compound found primarily in red meat and seafood", made in the liver and kidneys from arginine and glycine with a methyl group from methionine.³ About 95% of it sits in skeletal muscle, 1 to 2% is lost each day as creatinine, and the body replaces about 1 to 3 g a day, roughly half from the diet.³

A serving of creatine monohydrate therefore carries no grams of protein; asked "how much protein is in creatine", the answer is none. If a tub lists protein, it has been blended in and the label says how much.

Does protein powder contain creatine?

Only a trace, unless creatine has been added and declared. Whey comes from milk, and milk is not muscle. Creatine in food comes from muscle tissue, which is why the position stand places it "primarily in red meat and seafood",³ and a single 5 g dose of creatine monohydrate corresponds to the creatine in 1.1 kg of fresh, uncooked steak.⁴ Milk carries about 0.01 g per 100 ml on the figures given on what foods contain creatine, so neither a glass of milk nor a scoop of whey is a meaningful source, and plant proteins contain none. A shake delivers creatine only when creatine goes into it.

Can you mix creatine with a protein shake?

Yes. The one study that measured what the protein does to creatine found a modest, short-lived difference. Twelve men took four 5 g doses of creatine on separate occasions with 5 g of carbohydrate, with 50 g of protein plus 47 g of carbohydrate, with 96 g of carbohydrate, or with 50 g of carbohydrate; whole-body creatine retention was about 25% higher with the protein-and-carbohydrate drink and with the 96 g carbohydrate drink than with the 5 g control, and the authors reported that the insulin effect "was diminished within the initial 24 h of supplementation".⁵ So slightly more was retained in one four-dose study, and the effect faded within a day; that is a measurement, not a reason to buy a protein powder.

In 17 men given 2 g of creatine in water or baked into a protein-rich bar, absorption was slowed four-fold by the bar while the total absorbed and the rise in red-cell creatine were unchanged, and 24-hour urinary loss was 15% from water and 14% from the bar.⁶ Stir or shake, drink it promptly and swill the last mouthful, because monohydrate settles; how to take creatine covers mixing, scoops and the first month.

What did the trials find for each?

Creatine on its own: across 14 double-blind, placebo-controlled trials of adults aged 18 to 60 taking about 20 g a day for 3 to 7 days, mean power output during repeated sprints rose against placebo (standardised mean difference 0.61) and body mass rose by 0.79 kg, while peak power, fatigue and post-test blood lactate did not differ.⁷ In 22 randomised trials of 721 adults with a mean age of 57 to 70, creatine during resistance training for 7 to 52 weeks added 1.37 kg of lean tissue (95% confidence interval 0.97 to 1.76) over placebo, with small gains in chest press (standardised mean difference 0.35) and leg press strength (0.24).⁸

Protein supplements on their own: in 49 randomised trials of 1,863 healthy adults doing at least six weeks of resistance training, adding protein increased one-repetition-maximum strength by 2.49 kg (95% confidence interval 0.64 to 4.33) and fat-free mass by 0.30 kg (0.09 to 0.52) over training alone; above a total intake of about 1.6 g per kg a day, extra protein added no further fat-free mass.⁹

Both together, in men only: in 36 men training for six weeks, whey at 1.2 g per kg a day plus creatine at 0.1 g per kg a day gained more lean tissue and more bench press than whey alone or placebo, while squat strength and knee flexion rose by the same amount in every group.¹⁰ In resistance-trained men training for 11 weeks, creatine with whey, whey alone and creatine with carbohydrate each produced larger one-repetition-maximum gains on all three lifts tested, and more muscle growth, than carbohydrate alone, although the pattern of that growth differed between the three groups.¹¹

Do you need both?

Protein and creatine do different jobs, and the trials measured different things for each; which one, or both, depends on what you are training for and what your meals already give you.

Protein comes from food first. UK adults are advised 0.75 g of protein per kilogram of body weight a day, carried in the government's dietary recommendations as 45 g a day for a woman and 55.5 g for a man aged 19 to 64, with the training bands and worked examples on how much protein do you need a day.¹² A powder is one way to reach a target when meals fall short, and it carries protein's register wordings when it is at least a source of protein.¹ For choosing one, protein powder for women and collagen vs whey protein set out what each type is for, and what is a complete protein covers quality.

Creatine is for a specific kind of effort. Its wording applies at a daily intake of 3 g for adults doing high-intensity exercise;² if your training is steady and long, the register has no wording for you. Drink as you normally would; no trial has set a fluid volume to take with creatine (literature searched to 11 November 2026). How much creatine should you take covers the 3 g and 5 g doses.

Someone whose meals already reach their protein target and who lifts or sprints may want creatine alone; someone short on protein who runs may want the powder alone; a person doing both on a thin diet may want both. Collagen is a different protein again: can you take collagen and creatine together covers that pairing.

When should you take protein and creatine?

Any time, every day for creatine; protein spread across the day. Creatine depends on a store that takes weeks to fill, so the hour barely matters and missed days do; when to take creatine covers the small before-and-after trials. The protein trials above did not isolate timing: they compared total daily intake, and the 1.6 g per kg figure is a daily total.⁹ A post-workout shake with creatine stirred in serves both habits; no trial makes it a rule.

Who should check first?

Creatine raises the creatinine reading on a kidney blood test without changing measured kidney function in healthy adults, so anyone with kidney disease, or with a blood test coming up, should read creatine vs creatinine and tell their GP they take it. No dose for under-18s, or in pregnancy or breastfeeding, is given here. Creatine while pregnant or breastfeeding covers what has and has not been studied, and a midwife or GP is the person to ask. Anyone told to limit protein for a medical reason should ask their clinician before adding a powder.

What we don't know

No trial has given creatine plus protein against each alone in women, in adults over 60, or for longer than 11 weeks (literature searched to 11 November 2026). The retention study ran four doses in 12 men and did not follow performance;⁵ whether that first-day difference changes anything in a month of use is not measured. Both combined trials used whey; none has used a plant protein, and neither measured one shake against the two an hour apart.

Frequently asked questions

Can you mix creatine with a protein shake?

Yes. In 12 men, creatine taken with 50 g of protein and 47 g of carbohydrate was retained about 25% better than with 5 g of carbohydrate over four doses, and the difference faded within the first day.⁵

Which is better, creatine or whey protein?

They do different jobs, and the trials measured different things for each. Whey carries protein's wordings on the growth and maintenance of muscle mass;¹ creatine's wording is performance in successive bursts of short-term, high-intensity exercise at 3 g a day.²

Does whey protein have creatine in it?

Only a trace, because whey comes from milk and creatine in food comes from meat and fish.³ A whey product carries a useful amount only when creatine has been added and declared on the label.

How much protein is in creatine?

None. Creatine is a non-protein compound the body makes from arginine, glycine and methionine, and a serving of creatine monohydrate carries no protein grams.³

Can you take protein and creatine together every day?

Yes. The two combined trials ran daily for 6 and 11 weeks in men without reporting that the combination cost anything.^{10, 11} Anyone with a kidney condition or a medical reason to limit protein should ask their GP first.

Sources

1. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, spreadsheet of 19 May 2026: health claims sheet rows 170, 172 and 174 (protein; entry IDs 415, 417, 593, 594, 595, 715, 1398 and 416, 4704), and nutrition claims sheet row 20 ("source of protein", at least 12% of the energy value from protein). Page last updated 19 May 2026; fetched 11 November 2026. gov.uk.
2. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, spreadsheet of 19 May 2026: health claims sheet row 68 (creatine; entry 67). Page last updated 19 May 2026; fetched 11 November 2026. gov.uk.
3. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition, 2017. Position stand (narrative review); the society is sponsored by supplement companies. PubMed 28615996.
4. Harris RC, Söderlund K, Hultman E. Elevation of creatine in resting and exercised muscle of normal subjects by creatine supplementation. Clinical Science, 1992. Supplementation study, 17 people, muscle biopsies; funding not stated on PubMed. PubMed 1327657.
5. Steenge GR, Simpson EJ, Greenhaff PL. Protein- and carbohydrate-induced augmentation of whole body creatine retention in humans. Journal of Applied Physiology, 2000. Crossover study, 12 men; funding not stated on PubMed. PubMed 10956365.
6. Deldicque L, et al. Kinetics of creatine ingested as a food ingredient. European Journal of Applied Physiology, 2008. Crossover study, 17 men; funding not stated on PubMed. PubMed 17851680.
7. Glaister M, Rhodes L. Short-term creatine supplementation and repeated sprint ability: a systematic review and meta-analysis. International Journal of Sport Nutrition and Exercise Metabolism, 2022. Systematic review and meta-analysis, 14 double-blind randomised trials; funding not stated on PubMed. PubMed 36041731.
8. Chilibeck PD, et al. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access Journal of Sports Medicine, 2017. Systematic review and meta-analysis, 22 randomised trials, 721 participants; authors declare no conflicts. PubMed 29138605.
9. Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine, 2018 (erratum published 2020). Systematic review and meta-analysis, 49 trials, 1,863 participants; one author has received dairy-industry grants and fees, and the 2020 correction adds that another served on a sports-supplement manufacturer's advisory board. PubMed 28698222.
10. Burke DG, et al. The effect of whey protein supplementation with and without creatine monohydrate combined with resistance training on lean tissue mass and muscle strength. International Journal of Sport Nutrition and Exercise Metabolism, 2001. Randomised controlled trial, 36 men, 6 weeks; funding not stated on PubMed. PubMed 11591884.
11. Cribb PJ, et al. Effects of whey isolate, creatine, and resistance training on muscle hypertrophy. Medicine and Science in Sports and Exercise, 2007. Double-blind randomised trial, resistance-trained men, size not stated on PubMed, 11 weeks; funding not stated on PubMed. PubMed 17277594.
12. Public Health England. Government dietary recommendations, August 2016; protein figures from COMA's 1991 Dietary Reference Values report. Government guidance; fetched 11 November 2026. gov.uk.

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General information, not medical advice: if you have kidney disease, have been told to limit protein, are pregnant or breastfeeding, or take regular medication, ask your GP or pharmacist before starting creatine or a protein powder.