Guide

Creatine dose by goal: 5g isn't enough for the brain

Q: Do I need to take creatine with a loading dose?

Not for muscle. Loading at 20 to 25 g/day for 5 to 7 days saturates muscle faster, and 3 to 5 g/day gets to the same place over a few weeks. Loading does not reliably move brain creatine: 25 g/day for 7 days changed brain phosphocreatine by minus 0.7% to plus 3.9%.

Q: Is 5 g of creatine enough for the brain?

For most people, no. 5 g/day for short periods produced no measurable change in brain creatine. It worked in vegetarians, whose baseline is lower, at p<0.0001 over 6 weeks, and it worked as a depression adjunct. In healthy young omnivores, 10 and 20 g/day for 6 weeks were both null on cognition.

Q: Does creatine cause hair loss?

No human study has reported hair loss from creatine. The claim traces to one 2009 study of 20 rugby players that measured a rise in dihydrotestosterone. It has not been replicated in the years since, and the values stayed within normal clinical limits.

Q: Is creatine safe for kidneys?

Kidney studies span 1 to 80 g/day for 5 days to 60 months and found no impairment on estimated GFR, serum and urinary creatinine, urea, proteinuria or albuminuria. Anyone with existing kidney disease should be assessed with cystatin C or direct GFR, because creatine shifts serum creatinine independently of kidney function.

Q: How much creatine for cognition?

It depends on who you are. Raising brain creatine takes about 20 g/day for at least 4 weeks. Acute sleep-loss rescue takes a single 0.2 to 0.35 g/kg dose. Vegetarians and adults aged 66 to 76 respond at 5 g/day. Well-rested young omnivores have not been shown to respond at any dose tested.

5 g/day builds muscle. It does almost nothing for the brain in most people. The dose depends completely on what you are taking it for.

6 goal-specific doses5g works for muscle, not for brain20g/day x 4 weeks needed for brain uptake

Dose by goal

Goal	Dose	Duration	Evidence quality	Effect size	Best trial
Muscle and strength	3 to 5 g/day, or 20 to 25 g/day for 5 to 7 days as a load	Ongoing	High	Consistent lean mass and high-intensity performance gains	ISSN 2021 position stand[1][18]
Cognition, healthy young omnivore	10 or 20 g/day	6 weeks	Low, and negative	Null: processing speed p=0.17, memory p=0.95, executive p=0.59	Moriarty 2023, N=30[2]
Cognition, vegetarian	5 g/day	6 weeks	Moderate	Working memory and Raven's matrices, p<0.0001	Rae 2003, N=45[3]
Cognition, older adult 66 to 76	5 to 20 g/day	5 days to 24 weeks	Moderate	Memory SMD 0.88 versus 0.03 in the young	Prokopidis 2023 meta-analysis[4]
Acute sleep deprivation	Single 0.2 to 0.35 g/kg bolus, 14 to 25 g at 70 kg	One dose, peak at 4 h	Moderate	Reversed word memory, digit span and processing speed deficits	Gordji-Nejad 2024, N=15[6]; replication N=29[7]
Depression, SSRI adjunct	5 g/day	8 weeks	Moderate	Greater HAM-D improvement from week 2	Lyoo 2012, N=52[8]

All doses are creatine monohydrate. Split anything above 5 g into separate servings.

Why 5 g does not work for the brain in most people

The 3 to 5 g figure comes from muscle physiology. The ISSN describes maintenance as 3 to 5 g/day or 0.1 g/kg/day, with an optional 20 to 25 g/day load for 5 to 7 days[1]. That number saturates skeletal muscle. It was never derived from a brain endpoint.

Brain creatine behaves differently. Muscle sits behind a transporter that fills quickly at gram doses. Brain uptake is slower and the tissue is already tightly regulated, so brain creatine typically rises only 5 to 15% even under sustained supplementation[12]. Reviews of the magnetic resonance spectroscopy data report that lower doses around 5 g/day for short durations produce no noticeable change in brain creatine[5].

The cognitive trials match that. Moriarty ran 10 g/day against 20 g/day against placebo for 6 weeks in 30 healthy young adults and found nothing: processing speed p=0.17, episodic memory p=0.95, executive function p=0.59[2]. A 2018 systematic review put it plainly, that performance on cognitive tasks stayed unchanged in young individuals[13].

Two groups do respond at 5 g/day, and both were starting lower. Vegetarians eat almost no dietary creatine, and 45 of them on 5 g/day for 6 weeks improved backward digit span and Raven's matrices at p<0.0001[3]. A preregistered replication of the same protocol ran at N=123[15]. Older adults are the second group: pooled memory effect was SMD 0.88 in adults aged 66 to 76 against SMD 0.03 in those aged 11 to 31[4], and the single largest contributing trial gave 20 g/day for 7 days to 32 adults averaging 76 years[14]. A 2026 commentary re-analyzed that meta-analysis after correcting a unit-of-analysis error and found older adults were the only subgroup where the effect survived[16]. That is worth knowing before treating the pooled numbers as settled.

The 20 g/day protocol for brain uptake

If the goal is measurably more creatine in brain tissue, the dose is about 20 g/day and the duration is weeks, not days. Spectroscopy measurements summarized by Fabiano and Candow give the shape of it: 20 g/day for 4 weeks raised total brain creatine 8.7%, p=0.0008, with thalamus up 14.6% and white matter up 11.5%. A single 20 g dose moved it 3 to 7.7% and missed significance[5].

Loading alone is not enough. Solis gave roughly 25 g/day for 7 days and measured a change of minus 0.7% to plus 3.9% in brain phosphocreatine, which is nothing[5]. Seven days is a muscle protocol. The brain needs the four weeks.

Split the 20 g into four servings of 5 g. In a 28-day trial of 59 soccer players, a single 10 g dose produced diarrhea in 55.6% of participants against 28.6% on split 5 g doses, p<0.05, and split dosing did not differ from placebo[10]. Expect 1 to 3 kg of body weight in the first week at loading doses, mostly total body water[10].

One honest caveat: raising brain creatine and improving cognition are two different claims. The 20 g/day protocol has strong support for the first and weak support for the second outside acute stress and older age[2][17].

Acute protocol for sleep loss

This is the one place where a very large single dose has direct trial support. Fifteen adults kept awake for 21 hours took a single 0.35 g/kg dose, roughly 24.5 g for a 70 kg adult. It reversed the sleep-deprivation deficits in word memory, digit span and processing speed, with the maximum effect at 4 hours and measurable effects out to 9 hours[6]. A 29-person replication at 0.2 g/kg, mean 14.1 g, reproduced the result at the lower dose[7].

Three rules follow. First, this is a single bolus taken during the sleep-deprived window, not a daily regimen. Second, time it about 4 hours ahead of the work that matters. Third, it is 3 to 7 times the muscle dose, so the gastrointestinal cost is real and the water-weight shift is immediate[10].

The older approach was 20 g/day for 7 days before a 24-hour deprivation protocol, which also reduced decrements in reaction time, balance and mood[12]. The single-dose route is simpler and now has two trials behind it.

Contraindications and non-indications

Parkinson's disease: no. The NIH NET-PD LS-1 trial randomized 1,741 patients with early treated Parkinson's to 10 g/day or placebo across 45 sites, with a median 4 years of follow-up. It was stopped early for futility[9]. This is the largest creatine trial ever run and it is negative.

Depression: adjunct only. 5 g/day for 8 weeks alongside escitalopram in 52 women produced greater HAM-D improvement from week 2 onward[8]. Creatine was added to treatment, not substituted for it.

Hair loss: unsupported. The claim comes from one 2009 study of 20 rugby players in which dihydrotestosterone rose 56% after loading[11]. It has not been replicated, the values stayed within normal clinical limits, baseline DHT was 23% lower in the creatine group, and no study has reported hair loss in humans[1].

Kidneys: safe in healthy adults. Kidney-function studies span 1 to 80 g/day for 5 days to 60 months and consistently found no impairment on estimated GFR, serum and urinary creatinine, urea, proteinuria or albuminuria[10]. The cited cohorts were mostly healthy young men. If you already have reduced kidney function, ask for cystatin C or a direct GFR measure, because creatine supplementation raises serum creatinine without any change in kidney function[10].

How much to spend

Creatine monohydrate is the only form with the evidence base. Premium forms sold at a markup, hydrochloride, ethyl ester and buffered creatine, have no demonstrated advantage over monohydrate on muscle or cognitive endpoints[1]. Every trial cited on this page used monohydrate.

That makes the buying decision short: pick a tested by independent lab monohydrate and pay for grams, not for a proprietary name. A 20 g/day brain protocol burns four times the powder of a muscle dose, so price per gram is the number to compare.

Creatine Monohydrate Powder

DoNotAge

10 g creatine per serving
Muscle dose met in one serving

Score 8.6/10

AG1 Pro

AG1 (Athletic Greens)

5 g creatine per serving
Muscle dose met in one serving

Score 7.3/10

Daily Ultimate Essentials

IM8

3 g creatine per serving
Below 5 g, top up for the muscle dose

Score 6.9/10

Longevity Mix - Blood Orange

Blueprint

2.5 g creatine per serving
Below 5 g, top up for the muscle dose

Score 6.7/10

Creatine+

Elysium Health

5 g creatine per serving
Muscle dose met in one serving

Score 6.5/10

Advanced ID

ID Formulas

3 g creatine per serving
Below 5 g, top up for the muscle dose

Score 6.1/10

Ranked by our six-pillar overall score. See the full ranking: Best Creatine Supplements 2026.

Frequently asked questions

Do I need to take creatine with a loading dose?

Not for muscle. Loading at 20 to 25 g/day for 5 to 7 days saturates muscle faster, and 3 to 5 g/day gets to the same place over a few weeks. Loading does not reliably move brain creatine: 25 g/day for 7 days changed brain phosphocreatine by minus 0.7% to plus 3.9%.

Is 5 g of creatine enough for the brain?

For most people, no. 5 g/day for short periods produced no measurable change in brain creatine. It worked in vegetarians, whose baseline is lower, at p<0.0001 over 6 weeks, and it worked as a depression adjunct. In healthy young omnivores, 10 and 20 g/day for 6 weeks were both null on cognition.

Does creatine cause hair loss?