According to research reviewed by Gram, 30 days of a daily plant protein supplement combined with ashwagandha and rhodiola improved sleep quality in middle-aged adults. In this 2026 randomized controlled trial of 100 people, total sleep scores improved by 58%, a gain about 3.7 times larger than placebo, with no adverse events reported.
A 30-day study published in 2026 looked at whether a daily plant protein powder combined with two herbal extracts, ashwagandha and rhodiola, could help people sleep better. According to research reviewed by Gram, participants taking the combination reported large drops in sleep trouble and daytime sleepiness, and their overall sleep score improved by 58%. That improvement was about 3.7 times larger than in the placebo group. The study included 100 adults aged 35 to 70, and no side effects were reported. However, the trial was relatively small, sleep results came from self-reported questionnaires, and the study did not test whether the protein or the herbs caused the change. The results are promising but need confirmation from larger studies.
Key Statistics
A 2026 randomized controlled trial of 100 adults aged 35 to 70 found that 30 days of plant protein combined with ashwagandha and rhodiola reduced sleep difficulty by 56% in the supplement group.
In the same 2026 trial, the supplement group’s total sleep score improved by 58%, a gain about 3.7 times larger than the improvement seen in the placebo group.
The 2026 study reported no adverse events among participants who took the plant protein and ashwagandha-rhodiola combination over 30 days.
The Quick Take
- What they studied: Whether taking a plant-based protein powder with two herbal extracts, ashwagandha and rhodiola, could improve sleep quality in middle-aged adults.
- Who participated: 100 adults aged 35 to 70 were split evenly into two groups of 50. Sleep results were available for 61 people, and body composition measurements were available for 77 people with an average age of about 48.
- Key finding: Compared with the start of the study, the supplement group had 56% less sleep difficulty, 60% less daytime sleepiness, and a 58% better total sleep score. These gains were about 3.7 times larger than those in the placebo group, and the differences were statistically significant, meaning they were very unlikely to be due to chance alone.
- What it means for you: If you have trouble sleeping, this early evidence suggests a combined protein and herbal routine may be worth discussing with your doctor. Because the study was small and lasted only a month, it should not replace proven sleep habits or medical care.
The Research Details
Researchers recruited 100 adults aged 35 to 70 and randomly assigned them by chance to one of two groups. Neither the participants nor the researchers knew which product each person received, which is called double-blind. The supplement group took 27 grams of plant protein each day, made from pea, rice, and hemp, along with tablets containing 300 mg of rhodiola rosea and 500 mg of ashwagandha. The placebo group took look-alike products without the active ingredients.
Sleep quality was tracked with a validated questionnaire that participants completed every day for 30 days. Body composition was also measured using bioelectrical impedance, a harmless test that sends a tiny electrical current through the body to estimate water, muscle, and fat. One result from this test, called phase angle, is used as a rough marker of cell health.
The researchers used statistical methods that track changes within each person over time. They also used non-parametric tests, which are suited to data that do not follow a standard bell-shaped pattern.
A randomized, double-blind, placebo-controlled design is one of the strongest practical ways to test whether a supplement itself causes a change. Random assignment spreads out differences between people, and blinding reduces the chance that expectations shape the answers. Daily tracking over 30 days also captures changes as they happen, rather than relying on a single report made from memory.
The design is strong, and the study was published in a scientific journal. However, 39 of the 100 participants did not complete the sleep questionnaires, and dropouts can skew results if the people who left differed from those who stayed. Sleep was self-reported rather than measured in a sleep lab. The study lasted only 30 days, and readers should check the full paper for details on funding and any product sponsorship.
What the Results Show
The main finding was a clear improvement in sleep among people taking the supplement combination. In that group, sleep difficulty dropped by 56%, daytime sleepiness fell by 60%, and the total sleep score improved by 58%. The reported effect sizes, which measure how large a change is, fell in the range of 0.85 to 0.96. Experts generally consider effects of this size to be large enough to be noticed in everyday life, not just in statistics.
The placebo group also showed some change, but the supplement group’s improvement was about 3.7 times larger. This comparison is important because it helps separate the supplement’s effect from the general effect of joining a study and paying attention to sleep.
Body composition results told a different story. Phase angle changed very little in either group, so the study did not find a meaningful shift in this marker of cell health over 30 days.
The study also reported no adverse events, meaning no side effects were recorded during the trial. This is encouraging, though a 30-day study cannot rule out rarer problems that might appear with longer use.
Phase angle, the cell health marker, barely moved in either group. This suggests that 30 days may not be long enough to change it, or that it may not be a sensitive measure of the benefits seen in sleep. The absence of reported side effects is useful for readers, but the short timeframe limits how much can be said about long-term safety.
Earlier research has explored ashwagandha on its own, with some trials reporting improvements in stress and sleep quality. Rhodiola has been studied mainly for fatigue and stress, and plant proteins have been examined for their general health benefits. Few studies had tested these ingredients together, which this trial was designed to address. The results fit the broader picture of modest, promising effects from these herbs, but this single trial does not settle the question.
The study was small, with 100 participants in total and only 61 completing the sleep assessments. It lasted just 30 days, so it says nothing about longer-term use. Because the protein and the herbs were given together, the study cannot tell whether one, the other, or both were responsible for the sleep changes. Sleep was measured through daily self-reports, which can be affected by expectations even with blinding. The participants were middle-aged, so the results may not apply to younger adults, older adults, or people with diagnosed sleep disorders.
The Bottom Line
Confidence is moderate that this combination can improve self-reported sleep quality over 30 days in middle-aged adults, based on one well-designed trial. Confidence is lower about whether the benefit lasts, how it compares with other sleep strategies, and whether it applies to everyone. Research shows promising short-term results, but more trials are needed before strong recommendations can be made. Anyone considering these products should speak with a healthcare provider first, since ashwagandha and rhodiola can interact with some medications and health conditions.
Middle-aged adults who struggle with sleep and are interested in nutrition-based approaches may find this research relevant, especially if they also want to increase daily protein intake. It is less relevant for children, pregnant or breastfeeding people, and people with serious sleep disorders such as sleep apnea, who should seek medical care. People taking sedatives, thyroid medication, or other prescriptions should consult a doctor before trying these products.
Participants were tracked for 30 days, so that is the period in which results were measured. Some people may notice changes within the first few weeks, but the study does not give a clear picture of how quickly benefits first appeared. What happens after 30 days is unknown. A realistic approach is to give the combination at least a full month before judging whether it helps, keeping in mind that sleep improvements from any approach often take several weeks to appear.
Frequently Asked Questions
Does plant protein with ashwagandha and rhodiola improve sleep?
A 2026 randomized controlled trial found that 30 days of this combination improved sleep in middle-aged adults. The supplement group’s total sleep score rose 58%, and sleep difficulty fell 56%. Results come from one 100-person study, so larger trials are still needed to confirm them.
How long does it take for ashwagandha and rhodiola to help sleep?
The trial tracked participants daily for 30 days, and that is the only period studied. The study did not report how quickly benefits first appeared. Effects beyond one month are unknown, so a full month is the most reasonable period for judging results.
Is it safe to take ashwagandha with protein powder?
No serious side effects were reported in the 30-day trial of the combined protein and ashwagandha-rhodiola tablets. However, ashwagandha can interact with some medications and health conditions, so people taking prescriptions or managing thyroid or liver problems should consult a doctor first.
What is phase angle, and did it change in the protein study?
Phase angle is a measure from bioelectrical impedance testing that is used as a rough marker of cell health. In this trial, phase angle changed very little in either group, so the supplement did not show a meaningful effect on this marker over 30 days.
Want to Apply This Research?
- Log a daily rating from 0 to 10 for sleep difficulty, daytime sleepiness, and overall sleep quality each morning. Also record how many minutes it took to fall asleep and whether you took your protein and herbal doses that day.
- Set a daily reminder to take your protein and herbal products at the same time each day, and log each dose in the app. Pair this with a consistent bedtime routine. Ask your healthcare provider about the best timing for your situation before changing when you take any supplement.
- Treat the first 30 days as a baseline test and compare weekly averages in the app. Review the trend each month and share the results with your doctor at routine visits. Stop taking the products and seek medical advice if you notice stomach upset, unusual fatigue, or yellowing of the skin or eyes, which can signal liver concerns with herbal products.
This article summarizes one published study and is for general education only, not medical advice. Supplements are not regulated in the same way as medicines, and ashwagandha and rhodiola can interact with medications and health conditions. Talk with a qualified healthcare provider before starting or changing any supplement, especially if you are pregnant, breastfeeding, or managing a medical condition.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.