PlainPill

Whey Protein

People mainly take Whey Protein for performance, recovery, digestion. Based on 60 first-hand reports and 97 meta-analyses & systematic reviews in the medical literature. Ranked #271 of 1,974 overall.

37
User score
Mostly positive
30% positive2% mixed5% negative63% unclear

Of reports that state an outcome, 81% are positive.

Clinical research
AStrong research base
97
meta-analyses
691
RCTs
7,125
papers

What Whey Protein does, according to users

Of the people who reported each effect, the share who said it got better.

What the research says

Systematic reviews and meta-analyses from PubMed, with their published conclusions.

AStrong research base

3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.

Appl Physiol Nutr Metab · 2021 · Meta-analysis / systematic review
Whey protein supplementation and its potentially adverse effects on health: a systematic review

Conclusion: Analysis revealed that chronic and without professional guidance use of whey protein supplementation may cause some adverse effects specially on kidney and liver function. Presented data support a need for future studies co-relating the use of different types of whey protein with and without exercise to better see the impact on human physical health.

PubMed 32702243 ↗
J Nutr Health Aging · 2024 · Meta-analysis / systematic review
Improving sarcopenia in older adults: a systematic review and meta-analysis of randomized controlled trials of whey protein supplementation with or without resistance training

Conclusion: This review confirms that WP can improve various aspects of older adult with sarcopenia, thereby enhancing their overall physical condition. More studies should be conducted to validate this result and further explore the effects of WP and RT in patients with sarcopenia.

PubMed 38350303 ↗
Nutrients · 2023 · Meta-analysis / systematic review
Effectiveness of Whey Protein Supplementation during Resistance Exercise Training on Skeletal Muscle Mass and Strength in Older People with Sarcopenia: A Systematic Review and Meta-Analysis

Conclusion: WP supplementation during RET is more effective in increasing handgrip strength and skeletal muscle mass in older people with Sarcopenia compared with RET with or without placebo supplementation. However, the effect sizes were small, and the MD did not exceed the minimally important clinical difference. The quality of the evidence was low to very low according, to the GRADE approach. Further research is needed in this field.

PubMed 37571361 ↗
Nutrients · 2022 · Meta-analysis / systematic review
Effect of Whey Protein Supplementation in Postmenopausal Women: A Systematic Review and Meta-Analysis

Conclusion: WP supplementation did not show a significantly different effect on fat mass or body weight loss in both the subgroups; (4) Conclusions: In postmenopausal women, WP supplementation only in combination with RT enhances BC and LLLM compared to placebo controls. Without RT, WP has no significant benefit on muscle strength or lean mass.

PubMed 36235862 ↗

Dosage people report

As stated by users — not a recommendation. Follow the label or your doctor.

after a workoutas reported
30 g2x daily
180 g proteindaily
1 scoopas reported
daily at 6pmas reported
dailyas reported

Reported side effects

How often each side effect came up across all reports.

stomach issues ×2acne ×1brain fog ×1body odor ×1

What users say

Verbatim quotes, shortened only — each links to the original discussion.

“currently taking: glucosamine, whey protein, l-arginine, multivitamin, omega 3, magnesium, collagen (7g)”
Source discussion ↗
“I take a smoothie with whey protein and some fruits but need to add something else to help gain weight.”
Source discussion ↗
“*Whey Protein* - RSP Truefit (Question: Is isolate better?”
Source discussion ↗
“Whey protein.”
Source discussion ↗
“protein-forward first meal at noon, whey shake at 6pm”
Source discussion ↗
Top discussions (5)

Other options for performance

User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate