Does creatine do anything to your immune system?
Creatine influences immune cells via a specific switch, but whether the outcome is favourable or unfavourable depends strongly on the situation. For boosting immunity or preventing infections, there is too little evidence in humans to recommend it.
Creatine affects your immune system, but not in a straightforward way. It flips a specific switch in immune cells: macrophages shift from an attacking mode to a calming one. Whether that turns out to be beneficial or harmful depends entirely on the situation.
In healthy older adults with an average age of 68, 3 grams of creatine per day, combined with strength training, lowered the inflammatory markers IL-6 and TNF-alfa and reduced cell damage caused by free radicals. Creatine without training already had a smaller but measurable effect on TNF-alfa and a measure of that cell damage. This is the only true experiment in this selection, compared against a placebo. Two authors have financial ties to the manufacturer of the creatine used, which adds a note of caution to this finding.
In other situations, that same mechanism plays out unfavourably. In women with endometriosis, creatine steered macrophages toward that same calming profile, which promoted blood vessel formation and scar tissue and appeared to worsen the disease. In oesophageal cancer, that switch protected the tumour from the body's own immune defences. In mouse models, creatine did the opposite: it strengthened attacking immune cells against tumours. But this has not yet been studied in humans.
Do you want to take creatine to boost your immunity or prevent infections? That is too poorly studied to recommend: there are no human studies confirming this, and the right dose and duration are unknown. If you have endometriosis, cancer, or use medications that affect your immune system, discuss this with your doctor first. If you combine it with strength training as a healthy older adult, there is a cautiously positive signal for reduced inflammation. Pay attention to the label: choose creatine monohydrate, as that is the only well-researched form.
The evidence rests on a combination of cell and animal research, several reviews, and one randomised experiment involving 103 older adults. The mechanistic insights (the switch in macrophages) are relatively well supported by non-human research. The randomised experiment in older adults is the only one that can establish cause and effect in humans with any degree of certainty, but two authors have financial ties to the creatine manufacturer. Effects in children have barely been studied. The findings in endometriosis and oesophageal cancer are based on tissue analyses, not experiments.
What does alcohol do to your immune system?
Chronic excessive alcohol use weakens your immune system on multiple fronts simultaneously and increases the risk of serious infections. Light to moderate drinking appears less harmful, but offers no demonstrable benefit for your immune system.
Which supplements genuinely support your immune system?
Some supplements genuinely support your immune system, but the effect is greatest when you have a deficiency: so first check whether your vitamin D or zinc levels are adequate, and supplement in a targeted way.
Does beta-glucan help strengthen your immune system?
Beta-glucan demonstrably activates parts of the immune system, but the evidence that a supplement genuinely protects healthy people against infections is still too thin to recommend it.
Can air pollution weaken your immune system?
Air pollution disrupts your immune system in several ways at once: a greater chance of allergic reactions, less resistance to viruses. Limit your exposure as much as possible, especially during pregnancy.
Does creatine help with weight loss?
Creatine is not a slimming aid and is not recommended for fat loss as a primary goal. If you combine it with strength training, your body composition improves modestly: slightly less fat, more muscle mass.
Does creatine also help with memory and concentration?
Creatine can improve your memory, but mainly if you are older, vegetarian, or your brain is under pressure. If you are a young, healthy meat eater who sleeps well, the effect is small to negligible.