Health Claims

For male endurance athletes who are dehydrated after long workouts, drinking a little or a lot of fluid with carbs doesn’t make a difference in how fast their muscles refill energy stores in the first 4 hours after exercise.

Quantitative

Taking cinnamon with creatine doesn’t give young active guys any extra boost in strength, power, or endurance beyond what creatine alone already does — even though cinnamon might help with insulin.

Causal

For young, active guys taking creatine, adding carbs doesn’t seem to make it work better for boosting power, strength, or stamina—even though we thought insulin from carbs might help the body absorb more creatine.

Causal

Taking creatine for a few weeks can give young, active guys a boost in short bursts of power, help them lift heavier weights, and let them do more reps — basically making their muscles work better during quick, intense exercise.

Quantitative

If young, healthy guys take creatine with sugary drinks or a special mix of protein and sugar, less creatine comes out in their pee over 24 hours compared to taking it with just water.

Quantitative

If young, healthy guys take creatine with a sugary drink or a special mix of sugar and amino acids, their insulin levels spike faster than if they take creatine with just water.

Causal

If a young, healthy guy takes 5 grams of creatine with just water, his body absorbs it faster than if he takes it with carbs or with a mix of protein, amino acids, and carbs — and you can see that in his blood 15 minutes later.

Quantitative

If young, healthy guys take creatine with a mix of sugar, protein bits, and certain amino acids, it triggers about as much insulin as taking creatine with just a lot of sugar — and both help the body hold onto more creatine than if they took it with water.

Quantitative

You don’t have to take carbs every time you take creatine, but doing so might help your muscles soak up more creatine if you're trying to build strength.

Mechanistic

When you eat carbs, your body releases insulin, which helps shuttle creatine into your muscles more effectively—like a key that unlocks the door for creatine when sugar is around.

Mechanistic

If you take creatine with carbs after working out, your body absorbs about 25% more of it because the carbs raise your insulin, which helps shuttle creatine into your muscles.

Mechanistic

If young, healthy guys take a lot of creatine for 5 days straight, their muscles soak it up and end up with about 21% more creatine inside them.

Quantitative

Doing a tough leg workout with lots of sets makes your leg muscles start building new proteins much faster—2 to 3 times more than usual—right after the workout.

Mechanistic

Taking a lot of creatine for 5 days doesn’t seem to boost muscle repair or growth right after a workout in young, healthy guys—even though it does increase creatine levels in their muscles. So, creatine might help muscles grow in other ways, not by speeding up protein building right after exercise.

Mechanistic

Cyclocreatine kills brain tumor cells in rats by making them swell up, but it stops ovarian cancer cells in humans in a totally different way we don’t yet understand.

Mechanistic

In rat brain tumor cells, a substance called cyclocreatine gets pulled in using energy and sodium, but when sugar levels drop, this process slows down a lot—showing it needs energy from sugar to work well.

Mechanistic

When scientists gave a substance called cyclocreatine to two types of cancer cells, one kind (from rat brain tumors) stored a modified version of it, but the other kind (from human ovarian tumors) didn't — meaning these cells handle the substance differently.

Mechanistic

Cyclocreatine slows down the growth of certain cancer cells in a lab dish, but it doesn’t harm their outer layer or energy supply — so it probably works in a different way.

Mechanistic

When guys who lift weights gain muscle, their muscle cells also hold more water — and this happens whether or not they take creatine. It suggests that growing muscle might be linked to how much water the cells hold.

Correlational

If you're a guy who lifts weights, taking creatine won't make you hold more water outside your cells compared to just training — the water increase seems to come from working out, not the supplement.

Mechanistic

If you're a guy who lifts weights, taking creatine might help you gain more muscle and hold onto more water inside your cells than just training alone.

Causal

If you're a guy who lifts weights, taking creatine for 8 weeks can help you gain muscle and hold more water inside your muscle cells — but the water doesn't increase more than the muscle does, so it's not just 'bloating' — it's real growth.

Mechanistic

Taking creatine every day for two weeks doesn’t change how much water is in or around your cells — even though the balance between them might shift a little — at least in young women who work out regularly.

Descriptive

Taking a fake supplement (like sugar powder) for two weeks doesn’t change body water balance in young female athletes, so if real creatine does change it, the effect is likely from creatine itself.

Descriptive