Creatine: the one supplement with solid evidence

We manufacture supplements, which means we spend a lot of time explaining that the evidence behind most of this category is modest.

Creatine is the exception, and it is worth saying so plainly: it is among the most studied supplements in existence, the findings are consistent, it is inexpensive, and it has a good safety record.

It is also widely avoided in India for reasons that are mostly wrong. This article covers what it does, what it does not, and the myths specifically.

This is information, not medical advice. If you have kidney disease or any kidney concern, discuss creatine with your doctor before taking it, the section on kidneys below explains why this caution is specific rather than general.

What it is and how it works

Creatine is a compound your body already makes, from amino acids, in the liver and kidneys. You also get it from food, red meat and fish are the main dietary sources.

It is stored in muscle as phosphocreatine, where it serves a specific job: regenerating ATP during short, intense effort.

The practical meaning: in the first few seconds to half a minute of maximal work, a heavy set, a sprint, a jump, your muscle is running on stored ATP and phosphocreatine. More phosphocreatine means you can sustain that effort slightly longer or recover between efforts slightly faster.

Over weeks, that translates into more total training volume, and more training volume produces more strength and muscle. Creatine does not build muscle directly; it lets you train harder, and the training builds the muscle.

That is a modest, mechanistic claim, and it is the one the evidence supports.

And this is where it matters in India specifically

Vegetarians have lower baseline muscle creatine stores, because the dietary sources are meat and fish.

Which means vegetarians typically show a larger response to supplementation than habitual meat-eaters, who are already partly saturated.

In a country with a very large vegetarian population, that is a genuinely relevant point, and it is almost never mentioned in Indian gym culture, where creatine is instead treated with suspicion.

What the evidence supports

Strength and power output. The most consistent finding across many trials.

Lean mass gains, in combination with resistance training.

Improved performance in repeated high-intensity efforts.

High-intensity training capacity.

Some evidence for recovery between sessions.

And two areas of genuine ongoing interest, stated as such:

Cognition, there is research on creatine and cognitive performance, with some signal particularly under sleep deprivation and in vegetarians. This is interesting and not settled.

Older adults, creatine with resistance training has been studied for muscle mass and strength in ageing, which matters because sarcopenia is a real threat to independence. Promising, and a conversation for a doctor rather than a conclusion.

What it does not do

It is not a steroid. It is not a hormone, it does not affect testosterone, and it is not banned in sport. This confusion is common in India and it is simply a category error.

It does not work for everyone. Roughly a fifth to a third of people are “non-responders”, typically those whose muscle creatine is already near saturation, often habitual red meat eaters.

It does not produce dramatic fat loss.

It does not work without training. It is a training amplifier, not a substitute.

It does not help endurance performance meaningfully, the energy system it supports is the short, intense one.

The myths, specifically

“It damages the kidneys”

The most widespread belief, and the most consequential.

Where it comes from: creatine raises serum creatinine, which is the marker used to estimate kidney function. So a blood test on someone taking creatine can show a higher creatinine and look like impaired kidney function.

But the rise is because you are consuming creatine, which metabolises to creatinine, not because the kidney is failing to clear it. It is a measurement artefact, not kidney damage.

What the evidence shows: in people with healthy kidneys, studies including long-term use have not demonstrated kidney damage from standard doses.

Two practical consequences:

First, tell your doctor you take creatine before a blood test. Otherwise a raised creatinine may be misinterpreted, and in the worst case investigated unnecessarily.

Second, the caution is specific, not general. If you have existing kidney disease, reduced kidney function, or risk factors such as long-standing diabetes or hypertension with kidney involvement, this is a conversation for your doctor. The evidence of safety is in healthy kidneys, and extrapolating it to compromised ones is not justified.

That is a real distinction and it is usually collapsed in both directions, people with healthy kidneys avoid it needlessly, and people with kidney disease take it without asking.

“It damages the liver”

No evidence of this at standard doses in healthy people.

“You must do a loading phase”

Optional. Loading, a higher dose split across the day for about a week, saturates muscle stores faster. Taking a standard daily dose reaches the same saturation in three to four weeks without the gastrointestinal discomfort that loading sometimes causes.

If you are not in a hurry, skip it.

“You must cycle on and off”

No evidence supports this. Continuous use is well studied. Cycling simply means your stores drop and you re-saturate, which achieves nothing.

“It makes you fat” / “it’s just water”

There is water retention, and it is intramuscular, water drawn into the muscle cell, which is part of how it works. People typically gain a kilo or two early on, and that is water rather than fat.

It is not subcutaneous bloating, which is what people fear. It generally makes muscles look fuller rather than puffier.

“It causes hair loss”

This comes from a single small study that found an increase in DHT in a group of rugby players. It has not been replicated, and it did not measure hair loss. One unreplicated hormonal finding is not evidence of hair loss, and this myth is considerably more widespread than its basis.

“It causes cramps and dehydration”

Studied repeatedly, and the opposite if anything, some studies suggest better tolerance of heat and exercise. Reasonable hydration is sensible anyway, particularly in Indian summer, but creatine is not a cramp risk.

“It’s only for bodybuilders”

Covered above, the research base extends to older adults and to cognition, and the vegetarian response point makes it relevant to a lot of people who have never entered a gym.

Which form, and how much

Creatine monohydrate. This is the answer.

It is the form used in the overwhelming majority of the research, it is the cheapest by a wide margin, and no other form has been shown to be meaningfully better.

The alternatives you will be sold:

• Creatine HCl, more soluble, no demonstrated advantage
• Buffered / “Kre-Alkalyn”, no demonstrated advantage over monohydrate
• Creatine ethyl ester, studied and found worse
• Liquid creatine, unstable in solution
• “Micronised” monohydrate, the same compound, finer particle size, mixes better. Fine, and a minor convenience rather than an upgrade

The practical point: if a product charges a premium for a form other than monohydrate, you are paying more for less evidence.

Dose: the standard maintenance dose used across the literature is modest, on the order of a few grams daily. Your doctor or a qualified sports nutritionist should set it for you, particularly if you are very light, very heavy, or have any medical condition.

Timing: largely irrelevant. Saturation is what matters, not timing around a session. Take it whenever you will remember.

With food helps absorption slightly and reduces stomach upset.

Consistency matters more than anything else, daily, including rest days, because you are maintaining a store rather than fuelling a session.

Quality, which matters in India

Creatine monohydrate is a commodity and it is cheap. Which means a few things:

Be suspicious of expensive creatine. There is no premium version worth a large markup.

Be equally suspicious of implausibly cheap creatine, because adulteration and contamination are the risk in this category. Impurities including dicyandiamide and dihydrotriazine can be present in poorly manufactured material.

What to ask for:

• A COA showing creatine content and purity
• Heavy metal testing
• A recognisable manufacturer or a brand that will produce documentation
• Third-party certification, if you compete in tested sport, this is non-negotiable for anyone subject to doping control

And the plain-label warning: unbranded creatine sold loose at a gym counter, with no batch number and no documentation, is not worth the saving. This is a product you take daily for years.

Who should ask a doctor first

• Kidney disease, reduced kidney function, or a single kidney
• Long-standing diabetes or hypertension, where kidney involvement is possible
• Liver disease
• Pregnancy and breastfeeding, not studied adequately
• Under 18, generally not recommended without medical supervision
• On any regular medication, particularly anything affecting the kidneys, including NSAIDs taken regularly
• Before any blood test, tell them you take it

What a product can and cannot claim

We manufacture in this category, so the line matters.

What is sayable: creatine’s role in physical performance during short-term, high-intensity, repeated exercise, which is one of the better-substantiated performance statements available, and is permitted in several jurisdictions on that basis.

What is not: builds muscle, burns fat, increases testosterone, treats any condition, or improves memory. The cognition research is interesting and not a claim.

And the honest framing we use: creatine is a genuine, modest, well-evidenced performance aid that works alongside training. It is not a shortcut and it does nothing on its own.

Which leads to the thing worth saying in a sports nutrition article: the two supplements with real evidence in this category are protein, for meeting intake and preserving muscle, and creatine. Nearly everything else sold alongside them has weaker support, and several of the popular ones, testosterone boosters, fat burners, have essentially none.

That is an unglamorous shelf and it is the honest one.

The short version

1. Creatine is the best-evidenced supplement in sports nutrition. Consistent findings, cheap, good safety record in healthy people.
2. It works by regenerating ATP for short intense effort, which lets you train harder, and the training builds the muscle.
3. Vegetarians typically respond more, because dietary creatine comes from meat and fish. Highly relevant in India.
4. It does not damage healthy kidneys. It raises serum creatinine as a measurement artefact, so tell your doctor before a blood test.
5. But if you have kidney disease, ask your doctor. The safety evidence is in healthy kidneys.
6. It is not a steroid, not a hormone, and not banned.
7. Loading is optional. Cycling is unnecessary.
8. The hair loss myth rests on one unreplicated study that did not measure hair loss.
9. Weight gain early on is intramuscular water, not fat.
10. Monohydrate is the answer. Other forms cost more with less evidence; ethyl ester performed worse.
11. Ask for a COA and heavy metal testing. Loose unbranded creatine is not worth the saving.
12. Protein and creatine are the two with real evidence. Most of the rest of the shelf has far less.

Products in this range: whey protein powder and plant protein powder. Related: how to spot a fake protein tub.