Supplements and mood
Creatine and Mood: What the 2026 Research Actually Shows
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20266 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
QUICK ANSWER
A June 2026 review in Brain Medicine pooled five randomised trials. Two found creatine added to an antidepressant helped women with depression. Three found no clear benefit. The authors call it a signal, not a verdict. Before you credit or blame creatine for your mood, check thyroid, vitamin D, B12 and cortisol.
Find the panel that measures those four →As of August 2026. Creatine spent twenty years as a gym supplement. It is now being talked about for mood, and the reason is datable: a systematic review published on 30 June 2026 in Brain Medicine, followed by a wave of trade coverage in July.
The research is real. It is also much shakier than the headlines suggest. Here is the honest read, and the part the coverage skips: how to tell whether your low mood has a cause you can actually measure.
1. What did the 2026 review actually find?
A team led from the University of Ottawa searched the literature and found five randomised controlled trials, covering 238 people. Average age was 36. Most were women.
- Two trials found a benefit. Both were in women with major depressive disorder.
- Three found nothing clear. That split is the whole story.
- The strongest result: 5g of creatine daily alongside the antidepressant escitalopram, for eight weeks. Around 52% of the creatine group reached remission, against roughly 26% on placebo.
- Side effects were mild in people without bipolar disorder, mostly digestive.
The lead author, Bassam Jeryous Fares, put it plainly: “The signal is interesting, but it is not a verdict. Two trials pointed one way and three pointed another.” Note what the winning trials tested. Creatine was added to a prescribed antidepressant. It was not a replacement for one.
2. Why would a gym supplement touch mood at all?
The idea is about energy, not chemistry. Your brain is roughly 2% of your body weight and burns around 20% of your energy. Creatine helps cells recycle their fuel quickly.
Brain-imaging work has found lower energy compounds in some people with depression. So the theory is that topping up creatine gives tired brain cells more to work with. It is a reasonable theory. A reasonable theory is not a result, which is why three of five trials found nothing.
3. What else makes mood low, and can be measured?
This is the question worth answering first. Several common, correctable things affect mood, and each one shows up in blood.
- Thyroid. The NHS lists “low mood or depression” among the symptoms of an underactive thyroid. TSH and free T4 are the two markers.
- Vitamin B12. On B12 deficiency, the NHS describes “psychological problems, which can range from mild depression or anxiety, to confusion and dementia”. Our B12 guide covers the ranges.
- Vitamin D. Low levels are common through a UK winter, and low mood is one of the things people report. See the vitamin D guide.
- Cortisol. Your main stress hormone. Both ends of the range can leave you flat, as the cortisol guide explains.
Iron is worth adding to that list if you are tired as well as low. Ferritin sits on a different panel from the four above, and our energy and fatigue hub walks through which symptoms point where. A blood test measures biomarkers and offers wellness insight. It does not diagnose depression, and none of this replaces a conversation with your GP.
4. Is creatine safe to take for mood?
For most healthy adults, creatine monohydrate has a long safety record at 3g to 5g a day. The review found adverse events limited to mild digestive discomfort.
One finding did not make the headlines. Two trial participants with bipolar disorder developed mania. If you have bipolar disorder, or take any medicine for your mood, speak to a qualified clinician before starting creatine.
And the obvious one, said plainly. Never stop or change a prescribed antidepressant because of a supplement. The two trials that worked added creatine to treatment. They did not swap it out.
5. Does creatine change your blood results?
Yes, one of them, and it catches people out. Creatine raises creatinine, the waste product used to estimate kidney function. A higher creatinine on a supplement is usually a measurement artefact, not a kidney problem.
Our guide on creatine and creatinine explains how to read that result properly. Note it on your test form so nobody misreads it.
For the four mood markers, Helvy's General Energy & Wellness panel (£149) measures TSH, free T4, vitamin D, vitamin B12 and cortisol in one home finger-prick kit, alongside magnesium, CRP and your cholesterol markers. Samples go to UKAS-accredited UK laboratories, with results in around 5 working days. If you want a wider marker picture first, the full blood count guide is a good place to start.
READY TO TEST?
Rule out the measurable things first
Thyroid, vitamin D, B12 and cortisol are four common, correctable reasons to feel flat. All four sit on one home finger-prick panel. Results in around 5 working days from UKAS-accredited UK laboratories.
Frequently asked questions
Does creatine help depression?
The evidence is split. A June 2026 systematic review in Brain Medicine found five randomised trials. Two, both in women taking an antidepressant, reported meaningful improvement. Three found no clear benefit. The authors describe the finding as a signal rather than a verdict, and say it is not the kind of evidence that changes clinical practice.
How much creatine did the mood trials use?
Most used 5g of creatine monohydrate daily. One trial compared 5g with 10g. In the strongest trial, that 5g was taken alongside the antidepressant escitalopram for eight weeks, not on its own.
Can creatine make your mood worse?
Two participants with bipolar disorder developed mania during the trials. That is a small number, but it is a real signal. If you have bipolar disorder or take medicine for your mood, speak to a qualified clinician before starting creatine.
Which blood tests are worth doing for low mood?
Thyroid function, vitamin D, vitamin B12 and cortisol are the common measurable contributors. The NHS lists low mood among the symptoms of an underactive thyroid, and psychological symptoms among those of B12 deficiency. Helvy's General Energy and Wellness panel measures all four in one home finger-prick kit.
Should I stop creatine before a blood test?
You do not need to for thyroid, vitamin D, B12 or cortisol. Creatine does raise creatinine, so a kidney reading can look higher than it really is. Either note the supplement on your form or pause it for a couple of weeks before testing kidney markers.
Related guides
Does Creatine Raise Creatinine?
Why a supplement can make a kidney result look worse than it is.
Cortisol Blood Test UK
Your main stress hormone, and why both ends of the range leave you flat.
Vitamin B12 Blood Test UK
Ranges, symptoms and what a borderline result actually means.
Tired All The Time?
The full guide to the blood markers behind low energy.