Can You Mix Creatine With Protein Shakes?

Yes, you can mix creatine with a protein shake. In a 6-week trial of 36 men, those taking whey plus creatine gained more lean mass and bench-press strength than those on whey alone¹.

Creatine works whether you take it with other nutrients or not². The main things to avoid are leaving it dissolved for days and, if you have kidney disease, starting it without your clinician. Our creatine evidence page covers what it does on its own.

Yes. Two randomized trials gave creatine and whey protein together during resistance training. In one, the pair beat whey alone; in the other, it did as well as creatine with carbohydrate or whey alone.

• Burke 2001, 6 weeks, 36 men: whey (1.2 g/kg a day) plus creatine (0.1 g/kg a day) increased lean tissue mass and bench-press strength more than whey alone or placebo. Squat strength rose the same in every group¹.
• Cribb 2007, 11 weeks, trained men: creatine with whey, creatine with carbohydrate, and whey alone all produced greater strength gains and muscle growth than carbohydrate alone³.

Not every study agrees. A 2025 review by creatine researchers notes that some trials found no extra benefit from adding protein to creatine². So the shake is a convenient vehicle, not a booster you need. If you already drink a whey protein shake, stirring 3-5 g of creatine into it is a simple way to remember your daily dose⁴.

Can you mix creatine with protein powder and milk?

Yes. Milk is a fine vehicle, and protein plus carbohydrate taken with creatine helped the body hold on to more of it. In a loading study of 12 men, 5 g of creatine taken 4 times a day, each with about 50 g of protein and 47 g of carbohydrate, raised whole-body creatine retention by about 25% compared with creatine and almost no carbohydrate⁵. A glass of milk carries far less than that, so expect little extra effect from milk alone.

Any drink you like. How well the powder dissolves does not change how much your muscles take up⁴, though drinks with plenty of carbohydrate or protein can raise retention a little (see below).

• Water: the simplest option. A liter of water dissolves about 14 g of creatine at 20°C, so 5 g needs roughly a large glass⁶.
• Cold water: works, but dissolves less, about 6 g per liter at 4°C, so expect some grit at the bottom⁶. Stir again and drink it anyway.
• Hot water or tea: dissolves more, about 34 g per liter at 50°C⁶. Early creatine studies used hot tea for this reason, but better dissolving does not mean better uptake⁴.
• Milk, yogurt or a smoothie: fine. Stir creatine into yogurt the same way you would a protein powder.
• Orange juice or other juice: fine if you drink it straight away. Creatine breaks down faster in acidic liquids⁴, and juice adds carbohydrate, which can help retention (see below).
• Soda: also acidic, so the same rule applies: mix and drink.
• Coffee: see the caffeine section below and our guide to creatine and coffee.

Undissolved grains are still creatine. Swallowing them does no harm, and less than 1% of creatine monohydrate is degraded during digestion⁴.

Only for a short while. Creatine powder stays stable for years, but once dissolved it slowly converts to creatinine, a waste product with no benefit⁴.

The conversion speeds up at higher temperatures and lower pH, which is why a shelf-stable creatine drink has never worked out⁴. A review of creatine forms advises drinking it soon after mixing, or keeping it cold if you can't, since refrigeration slows the breakdown⁶.

In practice, a shake made in the morning and drunk after an evening workout is fine to keep in the fridge. A bottle mixed on Monday for Friday is not.

Carbohydrate increases how much creatine your muscles store, mostly by raising insulin, but large amounts are needed and the extra storage hasn't clearly led to extra strength.

• Green 1996, 24 men: 5 g of creatine followed by 93 g of simple sugar, 4 times a day for 5 days, raised total muscle creatine 60% more than creatine alone⁷.
• Steenge 2000, 12 men: about 50 g of protein plus 47 g of carbohydrate was as effective as 96 g of carbohydrate, raising creatine retention by about 25%⁵.
• Pittas 2010, 7 men: a mix of 14 g of protein, 14 g of amino acids and 57 g of sugar matched about 95 g of sugar for creatine retention⁸.

These were short loading studies. The 2025 review found limited evidence that pairing creatine with carbohydrate improves body composition or strength, or raises the maximum muscle creatine you eventually reach². A protein shake with some carbohydrate, or creatine with a meal, captures most of the effect without drinking 100 g of sugar.

Probably yes, at typical caffeine doses. The worry comes from two small trials that used 5 mg/kg of caffeine a day during loading; most other studies found neither benefit nor harm from the combination².

In that 1996 trial, 9 men took creatine (0.5 g/kg a day) for 6 days with or without caffeine (5 mg/kg a day). Creatine alone increased torque during repeated contractions by 10-23%. With caffeine added, the gain disappeared, even though muscle phosphocreatine rose by 4-6% in both groups⁹.

The 2025 review weighed about 10 studies. It concluded that short-term caffeine below 5 mg/kg a day likely does not oppose creatine. A single caffeine dose before exercise, taken after creatine loading, may add to performance². For a 70 kg adult, 5 mg/kg is 350 mg of caffeine, more than many single pre-workout servings.

Many pre-workout products already contain creatine, so check the label to avoid doubling up. For timing, see when to take creatine; consistency matters more than the hour².

A few combinations have trial data, and the gains over creatine alone are small or inconsistent. Results depend on the sport and the study, so combined use is hard to generalize¹⁰.

• Beta-alanine: a 2025 systematic review of 7 RCTs in 263 adults found the pair improved high-intensity, repeated-effort performance more than either alone, but not maximal strength or aerobic capacity¹¹. A 2026 network meta-analysis of 52 RCTs found no added benefit over creatine alone¹². See our beta-alanine page.
• Whey protein: covered above; two trials found gains in lean mass and strength, but results across studies are mixed^{1, 3, 2}.
• HMB: one rowing study found a benefit from creatine plus HMB, but most trials found no gain in body composition or strength over creatine alone².
• Sodium bicarbonate: several studies reported better repeated-sprint and anaerobic performance with the pair than with either alone².
• Glycerol: taken with creatine and water for 7 days, it increased total body water, which helped thermoregulation in hot, humid conditions².
• Fenugreek, cinnamon, D-pinitol and Russian tarragon: none improved creatine retention or results in the trials reviewed².

Whether creatine helps a specific goal is covered on our pages for creatine and muscle strength and creatine and athletic performance.

Supplements in this guide

• Creatine Monohydrate
• Whey Protein
• Beta-Alanine
• HMB

No food or drink makes creatine dangerous. What to avoid is mostly practical, plus a few situations that call for a clinician's input.

• Drinks left standing for days: see the section on mixing ahead of time.
• High daily caffeine during loading: 5 mg/kg a day interfered in two small trials²; see the caffeine section.
• A second creatine source by accident: pre-workouts and some protein powders already include it, so add up the label amounts.

Who should be careful

Kidney disease. Intakes up to 30 g a day for up to 5 years in patient groups, and 5-10 g a day for 21 months in college football players, were not linked to kidney problems¹³. The position stand still notes that people with existing kidney disease are often advised to see their physician first¹³. If you take medicines that affect the kidneys, ask your prescriber too. Our page on chronic kidney disease covers supplements in that setting.

Blood tests. A 2026 meta-analysis of 20 randomized trials found creatine raised serum creatinine by about 0.13 mg/dL, with no significant difference in urea or eGFR, though only 8 trials measured eGFR and the authors call for trials longer than a year¹⁴. A higher creatinine can look like reduced kidney function, so tell whoever orders your bloods.

Pregnancy. There are no well-designed human trials of creatine supplements in pregnancy, only animal data². Ask your midwife or doctor before using it.

GLP-1 medicines. Creatine has been proposed to help protect muscle during GLP-1 weight loss, but no randomized trial has tested it¹⁵.

Does creatine cause weight gain, side effects or hair loss?

Early weight gain is mostly water. Loading studies found about 0.5-1.0 L of fluid retention, roughly in line with the weight gained¹³, while several 5- to 10-week training studies found no rise in total body water⁴. The ISSN position stand found no evidence that creatine increases cramping, dehydration, stomach upset or kidney problems¹³.

The hair-loss worry traces to one study in rugby players whose DHT rose 56% during loading. It has not been replicated⁴. Our article on whether creatine causes hair loss goes through the evidence.

Keep it simple: one daily dose, stirred into whatever you already drink. Trials and the creatine research community use 3-5 g a day, or about 0.1 g/kg of body weight⁴.

• Measure: 3-5 g of creatine monohydrate, about one level teaspoon. Monohydrate is the form with the evidence⁶.
• Mix: add it to your protein shake, milk or water with the protein powder, and shake well.
• Drink: within a few hours, or keep it in the fridge until you do⁶.
• Repeat daily: taking it consistently matters more than taking it before or after training².

If you skip protein shakes on rest days, put the creatine in water, juice or coffee instead.

We searched PubMed for trials and reviews of creatine taken with protein, carbohydrate, caffeine, beta-alanine, HMB and other supplements, and for creatine's solubility, stability in liquids and kidney safety. We read 19 journal records, including the full text of 4 reviews, and cited 15, giving priority to systematic reviews, the ISSN position stand and randomized trials in adults.

Most combination trials are small, short and done in young men, so effects in women, older adults and over many months are less certain. Researched October 2026.

1. 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. Int J Sport Nutr Exerc Metab. 2001;11(3):349-64. doi:10.1123/ijsnem.11.3.349
2. Antonio J, et al. Part II. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?. J Int Soc Sports Nutr. 2025;22(1):2441760. doi:10.1080/15502783.2024.2441760
3. Cribb PJ, et al. Effects of whey isolate, creatine, and resistance training on muscle hypertrophy. Med Sci Sports Exerc. 2007;39(2):298-307. doi:10.1249/01.mss.0000247002.32589.ef
4. Antonio J, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?. J Int Soc Sports Nutr. 2021;18(1):13. doi:10.1186/s12970-021-00412-w
5. Steenge GR, et al. Protein- and carbohydrate-induced augmentation of whole body creatine retention in humans. J Appl Physiol (1985). 2000;89(3):1165-71. doi:10.1152/jappl.2000.89.3.1165
6. Jäger R, et al. Analysis of the efficacy, safety, and regulatory status of novel forms of creatine. Amino Acids. 2011;40(5):1369-83. doi:10.1007/s00726-011-0874-6
7. Green AL, et al. Carbohydrate ingestion augments skeletal muscle creatine accumulation during creatine supplementation in humans. Am J Physiol. 1996;271(5 Pt 1):E821-6. doi:10.1152/ajpendo.1996.271.5.E821
8. Pittas G, et al. Optimization of insulin-mediated creatine retention during creatine feeding in humans. J Sports Sci. 2010;28(1):67-74. doi:10.1080/02640410903390071
9. Vandenberghe K, et al. Caffeine counteracts the ergogenic action of muscle creatine loading. J Appl Physiol (1985). 1996;80(2):452-7. doi:10.1152/jappl.1996.80.2.452
10. Burke LM. Practical Issues in Evidence-Based Use of Performance Supplements: Supplement Interactions, Repeated Use and Individual Responses. Sports Med. 2017;47(Suppl 1):79-100. doi:10.1007/s40279-017-0687-1
11. Ashtary-Larky D, et al. Effects of Creatine and β-Alanine Co-Supplementation on Exercise Performance and Body Composition: A Systematic Review. Nutrients. 2025;17(13). doi:10.3390/nu17132074
12. Bai X, et al. Effects of combined versus single supplementation of creatine and beta-alanine on aerobic and anerobic performance: a systematic review and network meta-analysis. J Int Soc Sports Nutr. 2026;23(1):2695133. doi:10.1080/15502783.2026.2695133
13. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. doi:10.1186/s12970-017-0173-z Our study summary.
14. Tsiaras A, et al. The Effect of Creatine Supplementation on Kidney Function: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. J Ren Nutr. 2026. doi:10.1053/j.jrn.2026.04.010
15. Ostojic SM, et al. Creatine for glucagon-like peptide-1-associated muscle loss. Clin Nutr. 2026;66:106805. doi:10.1016/j.clnu.2026.106805