The trials say no. Is a protein shake inflammatory? In a 2025 meta-analysis of 53 randomized trials, milk protein supplements such as whey and casein did not change CRP, a common blood marker of inflammation. Two more meta-analyses of whey found no effect on inflammation markers. But shakes don't reliably lower inflammation either.
The new trial: 8 weeks of whey
In a 2026 randomized trial, researchers split 59 male athletes into two groups by sport. Thirty did power sports, and 29 did endurance sports. Half of each group took 30 grams of whey a day for 8 weeks. The rest took a placebo, and neither the athletes nor the researchers knew who got which.
Before and after, the team checked CRP (C-reactive protein, which the liver makes more of when the body is inflamed). They also checked two liver enzymes and CK (creatine kinase), a sign of muscle strain.
The muscle and liver numbers improved. ALT, AST and CK all fell in the athletes who took whey. CRP fell in the power athletes on whey. In the endurance athletes on whey, it barely moved.
Here's the catch. The authors say the CRP drop is a trend inside one group, not proof that whey worked better for one kind of athlete. Look at the placebo groups too. Their numbers held steady or went up over the 8 weeks, most of all in the endurance athletes, so some of the gap between whey and placebo came from the placebo side drifting upward.
A second 2026 trial tested a plant protein made from chickpeas. Twenty-four male road cyclists took 12 grams a day or a placebo for 14 days. CRP went down with the chickpea protein and up with the placebo. The authors were careful. They called these short-term blood changes and said nobody yet knows if they mean better recovery.
Two small trials in fit young men. That's a clue. For everyday shake drinkers, the bigger studies tell you more.
Is a protein shake inflammatory? What dozens of trials found
A meta-analysis pools many trials into one answer. In 2025, one team pooled 53 randomized trials of whey, casein or mixed milk protein in adults. The supplements had no real effect on CRP or on TNF-alpha, another signal tied to inflammation. IL-6, a third signal, dropped by 0.25 pg/mL. The authors judged that milk protein may not have any real effect on these markers.
Across 53 randomized trials, milk protein supplements did not change CRP.From a 2025 meta-analysis in Inflammopharmacology
Two other meta-analyses looked at whey alone. One, published in 2025, found whey had no significant effect on inflammation or oxidative stress compared with the control. The other pooled 11 randomized trials and found no effect on TNF-alpha or IL-6.
So if shakes stoked inflammation, these trials are where it would show up. It didn't.
Can whey lower inflammation?
Some people take shakes hoping for the opposite. A 2023 meta-analysis of 31 randomized trials in older adults found that whey lowered IL-6 and soy protein lowered TNF-alpha. The IL-6 drop was clearest in people with sarcopenia (age-related muscle loss) or pre-frailty. The authors added that the results may depend on who took part and for how long.
Other trials found nothing. In a 12-week trial, 65 adults with extra belly fat took 60 grams of whey a day or a carbohydrate powder. There were no differences in inflammation markers between the groups.
Do protein shakes help sore muscles?
This is where many people first meet a shake: after a hard workout. A 2023 meta-analysis of 29 studies found that protein taken around strength training helped people keep their maximum strength and lowered CK at 48 and 72 hours. It had no effect on muscle soreness.
A 2021 trial put it to a harder test. Forty active men did 100 drop jumps, then took 60 grams of whey a day or the same calories as carbohydrate for 9 days. Soreness, CK and CRP rose for a while in both groups, with no difference between them. Whey did not speed recovery. That short rise after hard exercise is normal. It is not the slow, long-lasting kind of inflammation this site is about.
Where your plate matters more
A shake is one item on a long menu. A 2026 umbrella review gathered 30 reviews covering 225 studies of whole eating patterns. The Mediterranean diet had the clearest link to lower CRP and IL-6. A vegetarian diet was linked to lower CRP, though that evidence was weaker.
What this means for you
Tick what you'll try this week. Your picks stay on this device.
you have kidney disease or have been told to limit protein, you have a milk allergy, or you plan to replace meals with shakes to lose weight.
One tap. Results appear once 50 readers have voted, and the count is always real.
The bottom line
A new trial found CRP dropping in power athletes who took whey. Dozens of earlier trials found protein powder leaving it about where it started. Put together, the picture is calm. Protein shakes don't appear to raise inflammation markers, and they don't appear to lower them much either. If yours helps you hit your protein goals after a workout, keep it. Then spend your energy on the rest of the plate.
Common questions
Does protein powder cause inflammation in the body?
Not in the trials so far. A 2025 meta-analysis of 53 randomized trials found that whey, casein and mixed milk protein supplements had no real effect on CRP or TNF-alpha. A separate meta-analysis of whey trials also found no significant effect on inflammation markers. Most of these trials tested milk proteins. They tell us less about every added ingredient in every shake.
Do protein shakes reduce inflammation?
Not reliably. In 11 randomized trials, whey had no effect on IL-6 or TNF-alpha. In 53 trials of milk protein, IL-6 fell by only 0.25 pg/mL. One 2023 meta-analysis did find whey lowered IL-6 in older adults, most clearly in people with muscle loss or pre-frailty.
Is protein powder anti-inflammatory?
The evidence is too mixed to call it that. A 2025 meta-analysis concluded that whey had no significant effect on inflammation markers. Two small 2026 trials in athletes saw CRP drop with whey or chickpea protein. The authors of both trials asked for longer studies before drawing firm conclusions.
Is plant protein better than whey for inflammation?
There is no head-to-head answer yet. In older adults, soy protein lowered TNF-alpha, and adding soy isoflavones lowered it a little more. A 2026 trial of chickpea protein in 24 cyclists lowered CRP over 14 days. Those results come from different studies, so they can't show one protein is better.
Ask the Research Desk
Heard something about inflammation you want checked? The best questions become articles, credited by first name only if you say yes.
How this article was made
Researched and written from 10 peer-reviewed papers. Our automated check matched every claim against the exact words of its source, confirmed every paper exists in PubMed, and found none retracted. Checked October 31, 2026. Not individually reviewed by a doctor. Photos are illustrative; the people in them are not patients or readers.
Grades run Strong, Moderate, Emerging, Early and Not supported, and the grade decides the words we may use. How we grade evidence · Medical disclaimer
Sources
- Randomized trialEffects of Whey Protein Supplementation on Muscle Damage, Hepatic Stress, and Inflammatory Markers in Power- and Endurance-Trained Athletes.Ben Mhamed M, Landolsi M, M'rad M et al. Eur J Sport Sci, 2026.PubMedFull paper
- Meta-analysisImpacts of supplementation with milk proteins on inflammation: a systematic review and meta-analysis.Mohammadi S, Ashtary-Larky D, Mehrbod M et al. Inflammopharmacology, 2025.PubMedFull paper
- Meta-analysisWhey Protein Intervention and Inflammatory Factors and Oxidative Stress: Systematic Review and Meta-analysis of Randomized Controlled Trials.Farahmandpour F, Haidari F, Heidari Z et al. Nutr Rev, 2025.PubMedFull paper
- Meta-analysisEffect of whey protein consumption on IL-6 and TNF-α: A systematic review and meta-analysis of randomized controlled trials.Jamshidi S, Mohsenpour MA, Masoumi SJ et al. Diabetes Metab Syndr, 2022.PubMedFull paper
- Meta-analysisThe impact of dietary protein supplementation on recovery from resistance exercise-induced muscle damage: A systematic review with meta-analysis.Pearson AG, Hind K, Macnaughton LS Eur J Clin Nutr, 2023.PubMedFull paper
- Randomized trialEffects of a chickpea protein hydrolysate on exercise-induced biomarkers of muscle damage and inflammation in federated road cyclists.García-Durán J, Sánchez-Oliver AJ, Rodríguez-Martín NM et al. J Int Soc Sports Nutr, 2026.PubMedFull paper
- Meta-analysisEffects of whey and soy protein supplementation on inflammatory cytokines in older adults: a systematic review and meta-analysis.Prokopidis K, Mazidi M, Sankaranarayanan R et al. Br J Nutr, 2023.PubMedFull paper
- Randomized trialThe Combination of Whey Protein and Dietary Fiber Does Not Alter Low-Grade Inflammation or Adipose Tissue Gene Expression in Adults with Abdominal Obesity.Rakvaag E, Fuglsang-Nielsen R, Bach Knudsen KE et al. Rev Diabet Stud, 2019.PubMedFull paper
- Randomized trialWhey protein supplementation does not accelerate recovery from a single bout of eccentric exercise.Hilkens L, De Bock J, Kretzers J et al. J Sports Sci, 2021.PubMedFull paper
- Umbrella reviewDietary Patterns Associated With Anti-inflammatory Effects: An Umbrella Review of Systematic Reviews and Meta-analyses.Reyneke GL, Lambert K, Beck EJ Nutr Rev, 2026.PubMedFull paper
