Creatine HCl vs. Monohydrate: Which Form Wins?

“For nearly everyone, creatine monohydrate is the form to choose,” says Brinya Kydd, MS, RDN, a body recomposition registered dietitian nutritionist. “As the gold standard, monohydrate is the most studied, most effective, and least expensive option.”

Monohydrate has decades of research and cost-effectiveness on its side, and is widely considered the best creatine for athletes — and anyone else, for that matter. On the other hand, HCl is easier to mix into drinks and offers possible stomach comfort benefits at smaller doses (although no head-to-head trial has confirmed this).

“No alternative form, including creatine HCl, has been proven to outperform [monohydrate] according to research,” says Kydd.

Time for a quick chemistry lesson on creatine monohydrate vs HCl (I promise to make it painless). Both creatine monohydrate and creatine HCl deliver the same creatine, just in different forms. The difference is what the creatine is attached to, and how it dissolves:

• Creatine monohydrate is creatine bound to a single molecule of water.

• Creatine HCl is creatine bound to hydrochloric acid, which dissolves better in water.

“But better solubility doesn’t equal better results in your muscles,” says Kydd. “Once creatine gets into your body, monohydrate is absorbed at roughly 99%, so there’s very little room for another form to improve on it.”

Creatine HCl is a newer form of creatine that’s more water soluble. Some people theorize that this may improve absorption, reduce bloating, and improve stomach discomfort. But what does the science say? 

A lot of creatine HCl marketing leans one one 2015 study, published in Food and Nutrition Sciences. The study initially involved 40 subjects, although 10 were excluded for not participating. The subjects were divided into creatine monohydrate (5g/day), creatine HCl (1.5g/day and 5g/day), and control groups. Each group performed resistance training for four weeks.

After four weeks, both creatine HCl and monohydrate groups had improved strength, but only the HCl group had changes in body composition (decreased fat mass).

The researchers concluded that creatine HCl is more effective at body recomposition. However, this study was short and small, with each group only having about seven participants, and its results haven’t been replicated.

Newer research has also tried to answer the question “is creating HCl better than monohydrate?”... with mixed results.

A 2024 study, published in Physiological Research, examined 40 participants who took either creatine HCl, monohydrate, or placebo for eight weeks whilst resistance training. Both creatine forms beat placebo when it came to strength, muscle mass, and fat loss.

Creatine HCl showed no benefit over monohydrate.

A 2025 study, published in Journal of the International Society of Sports Nutrition, looked at 31 elite team sport athletes who took either creatine HCl (5g/day), creatine monohydrate (5g/day), or placebo for eight weeks.

The researchers concluded that claims of creatine HCl superiority are “unfounded and misleading.”

And most recently, a 2026 study in the Journal of the International Society of Sports Nutrition, involved 40 collegiate soccer athletes who trained for four weeks and took either creatine HCl, monohydrate, ethyl ester, or placebo during that time.

They found advantages in sprinting and jumping for the creatine HCl group, compared to the monohydrate group. However, that study was small, short, and is awaiting replication. 

Overall, the research on creatine HCl and its potential benefits — or not — compared to creatine monohydrate is growing. But it still pales in comparison to the hundreds of published studies on creatine monohydrate.

To put this into perspective, in a recent review of creatine safety (published in the Journal of the International Society of Sports Nutrition), 685 creatine studies were included and 95% of them used creatine monohydrate.

So, what do the experts think of all this research? The International Society of Sports Nutrition’s (ISSN) official stance is that creatine monohydrate is the most extensively studied and clinically effective form of creatine. 

Creatine HCl is often marketed as being “better” than monohydrate based on one claim: it’s more soluble (AKA, it dissolves more easily in liquids).

It’s true that creatine HCl is more soluble than monohydrate — about 38x more soluble in water, to be exact. This was shown in a 2010 lab study published in the Journal of Dietary Supplements.

However, that same study found that even though creatine HCl was more soluble than monohydrate, it wasn’t absorbed any better by intestinal cells.

To date, there have been no human bioavailability studies showing HCl absorbs better than monohydrate. Currently, the only possible support is a rat study and computer simulation, published in Pharmaceutics.

The take home message? Solubility is a test tube fact, but doesn’t represent any real-world advantage when it comes to your body’s ability to actually absorb creatine.

Creatine HCl does mix into liquids clearer, and with less grit, than typical creatine monohydrate. But that doesn’t mean you have to make the swap. If your creatine feels gritty, then micronized monohydrate can solve that problem for you thanks to its ultrafine powder.

Creatine HCl has a reputation for causing less stomach upset and bloating than creatine monohydrate does. However, this is purely anecdotal — no study to date has compared the two forms regarding stomach discomfort.

And when it comes to the recommended 5 g/day dose of monohydrate, side effects are rare. “Stomach upset with creatine monohydrate is real, but generally uncommon and usually mild,” says Kydd. “It’s most often linked to taking a large dose at once, known as a loading phase, rather than the standard daily amount.”

Bloating and water retention from creatine monohydrate are also uncommon. If that occurs at all, it’s usually limited to the first three days of a loading dose, per the Journal of the International Society of Sports Nutrition.

If you experience stomach upset, bloating, or similar side effects whilst taking creatine monohydrate, then try adjusting the way you take it before switching to HCl.

“Before making the switch to HCl, skip the loading phase,” recommends Kydd. “Take 3 to 5 grams a day, split the dose into smaller amounts, and take it with food and plenty of water.”

If that still doesn’t work, then you might consider switching to creatine HCl to see if it suits you better. But if you tolerate monohydrate, then there’s little reason to switch.

The extensive research record, the cost-per-dose math, and the certification landscape all point to one winner when it comes to creatine HCl vs creatine monohydrate. In almost all cases, monohydrate comes out on top.

At Momentous, we sell creatine monohydrate only, because that’s what the evidence supports. Momentous’ Signature Spec creatine is third-party tested and NSF certified for sport. The ultrafine powder makes it easy to mix into water, coffee, or whatever else you choose.

If you prefer not to mix your creatine into liquids at all, then creatine chews provide pure creatine monohydrate in an easy-to-chew tablet.

It may make sense to try creatine HCl if the recommended 3 to 5g/day dose of monohydrate upsets your stomach or causes side effects — and you’ve already tried hacks like splitting the dose into smaller amounts across the day, and taking it with food and water. It’s worth a shot, but keep in mind that HCl causing less stomach upset hasn’t actually been proven in trials.

If you’re ready to try creatine monohydrate, then check out Momentous creatine here.

No, studies don’t show that creatine HCl works any better for building muscle than creatine monohydrate does. In the 2024 Physiological Research study, creatine HCl showed no benefit over monohydrate when it came to muscle mass, strength, or fat loss.

No, you don’t need to cycle creatine monohydrate or creatine HCl. According to the ISSN, creatine can be taken continuously and safely over the long term, with up to five years of continuous use being studied. Cycling (periodically stopping and restarting) was once thought to be necessary, but research shows no clear benefit to doing so. The key to creatine is consistency: daily use helps maintain muscle creatine levels for optimal strength, performance, and recovery benefits over time.

No, a loading phase is not necessary with either creatine monohydrate or creatine HCl. While loading can accelerate effects, some people report stomach upset. Consistent daily use is what really matters for both forms — 3 to 5 g of creatine monohydrate daily will saturate your muscle stores within three to four weeks.

Yes, women can absolutely take creatine monohydrate or creatine HCl. Both are safe, effective, and beneficial for women just as they are for men. Creatine for women does not cause bulky weight gain (that’s largely a creatine myth), though some initial water retention may occur with monohydrate.