Creatine, Your Muscles' Spare Change

Drew, I read that your muscles run out of fuel in about two seconds. Two! I can't find my keys in two seconds.

Fair. Muscles hold a tiny stockpile of ATP, which is basically the cash your cells spend. Then they need a refill, fast.

So where does the refill come from?

A backup tank called phosphocreatine. That's creatine with a phosphate attached. Think of a spare coin sitting in your pocket.

Okay, but how does the coin become cash? Give me the mechanism.

Spent ATP becomes ADP, which is ATP missing one piece. An enzyme called creatine kinase, a protein that speeds up reactions, grabs the phosphate off phosphocreatine and snaps it onto ADP. ATP again. Muscle keeps going.

So it's a vending machine that gives change.

That's better than my analogy, and I'm annoyed.

And this tank covers what, exactly?

Roughly the first ten seconds of maximal effort. Sprints, heavy squats, hauling a suitcase upstairs. After that, sugar burning and oxygen systems take over.

So a marathoner gets nothing from it?

The case is strongest for short, hard bursts. Long easy efforts lean on the oxygen system instead.

Fine. Monday morning. What do I actually buy?

Creatine monohydrate. Plain, boring, most studied. Boring is the feature. Skip the fancy blends with a rocket on the label.

How much? And when?

Studies typically use a few grams a day. Showing up daily seems to matter more than perfect timing. Stir it into coffee or yogurt and forget about it.

Any catch?

Some people hold a bit more water in their muscles. And if you have kidney issues or take medication, check with your doctor first. Meat and fish contain some creatine too, just usually less.

So what's the takeaway?

A small daily scoop of monohydrate, paired with strength training, for a few weeks. Bigger spare coin purse for your muscles. It will not, sadly, find your keys.