Is Creatine Safe and Good for Type 2 Diabetes?

Probably safe, and possibly helpful when you also exercise. In the only placebo-controlled trial in type 2 diabetes, people who took 5 grams of creatine a day while doing an exercise program saw their HbA1c fall about 1 point more than people on placebo. That was 25 people for 12 weeks, so the benefit is promising but not proven.

HbA1c (often shortened to A1c) is a blood test that shows your average blood sugar over the past 2 to 3 months. The evidence on creatine and diabetes comes from that one small trial, a handful of studies in healthy people, and several reviews. Kidney safety has been studied more than the blood sugar effect, and it looks reassuring for people whose kidneys work normally.

What the Data Show

The key study is a 12-week randomized, double-blind, placebo-controlled trial from the University of São Paulo. Twenty-five adults with type 2 diabetes were analyzed: 13 took 5 grams of creatine a day and 12 took a placebo. Everyone followed the same exercise training program.

In the creatine group, HbA1c fell from 7.4% to 6.4%. In the placebo group it went from 7.5% to 7.6%. The difference between groups was 1.1 percentage points.

The creatine group also had lower blood sugar at 0, 30 and 60 minutes during a test meal, and a smaller overall glucose rise. Insulin and C-peptide (a marker of how much insulin the pancreas makes) were about the same in both groups. Side effects, cholesterol and fitness were comparable between the groups.

The wider evidence is less clear. A 2022 meta-analysis of 9 studies, most of them in people without diabetes, found no overall effect of creatine on fasting blood sugar or on insulin resistance. It did note that the 2 studies in people with diabetes found a benefit. Its authors concluded there is not enough evidence yet to say creatine improves diabetes markers.

A 2021 review by the same São Paulo group reached a similar place: early small trials in type 2 diabetes are promising, but creatine’s effect on blood sugar control is yet to be confirmed. One of its authors has advised and received research support from a company that makes creatine.

Does Creatine Lower Blood Sugar?

In people with type 2 diabetes who exercise, it appears to, based on one trial. In people without diabetes, the results depend on exercise.

In a 3-month trial of 22 sedentary healthy men who all started moderate aerobic training, those on about 10 grams of creatine a day handled a glucose drink better than those on placebo. Fasting insulin and insulin resistance did not change.

A systematic review of 16 years of studies found the same pattern. Creatine combined with exercise training had larger benefits on blood sugar, while creatine alone showed positive results in only a few studies. The reviewers also warned that the results cannot be applied to people with poorer blood sugar control, older people, people on insulin, or people who are not active.

Why Would Creatine Lower Blood Sugar?

The answer seems to be a protein called GLUT-4. Think of GLUT-4 as a doorway on the surface of a muscle cell. When more doorways open, sugar moves out of the blood and into the muscle.

In the diabetes trial, the creatine group had more GLUT-4 moved to the muscle cell surface, while insulin levels stayed the same. So creatine did not push the pancreas to make more insulin. It seems to help muscle pull in sugar on its own.

Studies in healthy volunteers point the same way, with one catch. In a trial where one leg was put in a cast for 2 weeks, GLUT-4 fell by 20% in the placebo group but not in the creatine group. During the 10 weeks of weight training that followed, GLUT-4 rose by about 40% in the creatine group.

A similar trial of 33 people found creatine raised GLUT-4 in the trained leg but had no effect in the leg that was not trained. The authors concluded that creatine raises GLUT-4 in human muscle only when activity levels change. That is the catch: the muscle has to be working.

Does Creatine Work Without Exercise?

Probably not much. No trial has tested creatine alone in people with type 2 diabetes.

In a randomized trial of 17 healthy untrained men, creatine taken for about a month without any training did not change glucose tolerance or insulin sensitivity.

One newer study adds a small question mark. In a 2026 trial of healthy sedentary middle-aged and older adults, creatine without exercise increased lean muscle and strength and produced favorable changes in HbA1c and some blood fats. The authors called the blood marker findings exploratory, and these were healthy people, not people with diabetes.

Does Creatine Raise Blood Sugar or A1c?

No study I found shows that creatine raises blood sugar. Creatine is not a sugar and does not contain carbohydrate. In the trials above, blood sugar either stayed the same or went down, and the meta-analysis found no effect on fasting glucose either way.

One practical point: some creatine powders and drinks are mixed with sugar or sold in sweetened blends. Plain creatine monohydrate avoids that.

Is Creatine Safe for Diabetics’ Kidneys?

For people with type 2 diabetes and normal kidney function, the one trial that checked says yes, at least over 12 weeks. Kidney disease is a common complication of diabetes, so this question matters.

In a 12-week randomized, placebo-controlled trial in type 2 diabetes, researchers measured kidney filtration directly with a tracer, which is more accurate than the usual blood test. Filtration did not change: the creatine group went from 90.4 to 96.1 and the placebo group from 97.9 to 96.4 (mL/min/1.73 m²). Creatinine clearance, urea, electrolytes and protein or albumin in the urine were also unchanged.

There is one catch worth knowing before your next blood test. The usual kidney number, eGFR, is calculated from creatinine, a waste product that muscle makes from creatine. Taking creatine raises creatinine a little.

A 2026 meta-analysis of 26 randomized trials with 1,036 people found creatine raised blood creatinine by 0.14 mg/dL. That lowered the calculated eGFR by about 10.75 mL/min. When kidney filtration was measured directly with a tracer, there was no significant change. The authors concluded this reflects how creatine changes the creatinine reading, not kidney injury.

A second 2026 meta-analysis of 20 trials found a similar rise in creatinine of 0.13 mg/dL with no difference in eGFR or urea. It noted that trials longer than 1 year are still needed.

If you have diabetes and your doctor tracks your kidneys with eGFR, tell them you take creatine so a small bump in creatinine is read in context. A cystatin C test, a kidney marker that muscle does not affect, is another option.

No trial has tested creatine in people with diabetic kidney disease. If your kidney function is already reduced, that is a reason for caution.

How Much Creatine Did the Diabetes Trial Use?

The trial in type 2 diabetes used 5 grams a day for 12 weeks, with no loading phase, alongside an exercise program. Studies in healthy people used anywhere from 3 to 20 grams a day. No study has compared doses for blood sugar.

Study	People	Dose	Exercise	Blood sugar result
Gualano 2011	25 with type 2 diabetes	5 g/day, 12 weeks	Yes	HbA1c 1.1 points lower than placebo
Gualano 2008	22 healthy sedentary men	About 10 g/day, 3 months	Aerobic training	Better glucose tolerance
Newman 2003	17 healthy untrained men	20 g/day for 5 days, then 3 g/day	No	No change

Dr. Kumar’s Take

The pattern across these studies is consistent: creatine seems to help blood sugar through working muscle. Without training, the benefit mostly disappears. That makes sense, because muscle is where most of the sugar from a meal ends up, and creatine appears to help muscle open more doors to let it in.

The honest limit is size. One trial of 25 people is a signal, not a verdict, and a 2022 meta-analysis did not find a broad effect. What does look solid is safety: in people with normal kidneys, creatine has not harmed kidney function in the trials, including the one in diabetes. The small rise in creatinine on a blood test is the thing most likely to cause confusion.

Practical Takeaways

Treat creatine as an add-on to exercise, not a replacement for it or for diabetes medicine.
The diabetes trial used 5 grams a day of creatine alongside regular exercise training.
Choose plain creatine monohydrate rather than sweetened blends.
Tell your doctor you take creatine before kidney blood tests, since it raises creatinine and can make eGFR look lower than it is.
Be cautious if your kidney function is already reduced. No trial has tested creatine in diabetic kidney disease.
Keep checking your A1c. It is the number that shows whether anything is working.

FAQs

Can a diabetic take creatine?

Most people with type 2 diabetes and normal kidney function can. In a 12-week trial in type 2 diabetes, side effects were similar to placebo and measured kidney function did not change. If your kidney function is reduced, talk with your doctor first.

Does creatine lower A1c?

In one trial of 25 people with type 2 diabetes who were also exercising, A1c fell from 7.4% to 6.4% on creatine and stayed about the same on placebo. A larger meta-analysis did not find an overall effect on fasting blood sugar, so this still needs confirmation.

Does creatine increase blood sugar?

No study has shown that it does. Blood sugar either stayed the same or fell in the trials, and creatine itself contains no sugar. Check the label, since some blends add sugar.

Is creatine bad for diabetics’ kidneys?

Not in the trials so far. Creatine raises creatinine on a blood test, which can make eGFR look lower, but direct measurement of kidney filtration showed no real change. People with existing kidney disease have not been studied well.

Does creatine work for blood sugar without exercise?

Probably not much. In healthy men who did not train, creatine did not change glucose tolerance, and it raised muscle GLUT-4 only in muscle that was being trained.

Bottom Line

Creatine looks safe for people with type 2 diabetes and normal kidneys, and paired with exercise it lowered A1c by about 1 point in one small trial. That benefit has not been confirmed in larger studies, and it seems to depend on working muscle. If you use it, take plain creatine monohydrate, keep exercising, and let your doctor know before your next kidney blood test.

Is Creatine Safe and Good for Type 2 Diabetes?