Creatine

creatine monohydrate · creatine

The most evidence-backed supplement for preserving muscle and strength with age.

TypeSupplement / dietary

The grade answers: What does the human evidence support for: Muscle, strength & power in aging?

Grade

Moderate

The grade rates evidence quality — it is not advice to take or buy.

Class: Muscle / bioenergetics
Primary use: Muscle, strength & power in aging
Evidence strength: medium
Last reviewed: 2026-07-01

One grade per claim

The same substance can have solid evidence for one thing and none for another. A single grade would hide the very difference you came here for.

Claim	Grade	Based on
Increases muscle strength in older adults when combined with resistance training 10 RCTs. Upper-body strength improved; lower body only in trials of 24 weeks or more.	B	Functional outcome How the body works: strength, gait speed, cognition.
Increases muscle mass Direct MRI/CT imaging finds a real but very small effect (0.10-0.16 cm), and smaller in older adults than younger ones. The meta-analysis in older women found no significant effect on mass at all.	C	Functional outcome How the body works: strength, gait speed, cognition.
Improves memory in older adults 8 RCTs, overall SMD 0.29. The effect sits almost entirely in the 66-76 age band and is absent in the young, which is a subgroup finding rather than the primary result.	C	Functional outcome How the body works: strength, gait speed, cognition.
Extends human lifespan No trial has ever measured this. Creatine targets a mechanism of functional aging, not aging itself — the longevity framing is inference, not evidence.	not graded	Mechanism only Pathway evidence. Explains why, does not prove benefit.

Bottom line

Not an 'anti-aging' pill — but one of the very few supplements with genuinely strong human evidence, for muscle, strength and power in older adults, especially paired with resistance training. Lifespan itself is not the endpoint studied.

What the evidence says

Creatine has a large, consistent randomized-trial base for improving muscle mass, strength and power, and the effect is most reliable when combined with resistance exercise — which matters because sarcopenia and frailty are major drivers of disability in aging. Cognitive benefits (for example under sleep deprivation or metabolic stress) are promising but less consistent. It has no trials on lifespan or age-related disease incidence, so the 'longevity' framing is indirect: creatine targets a mechanism of functional aging (muscle loss), not aging itself. On that functional claim the evidence is strong enough for grade B.

Key studies

[1]
Creatine + resistance training on strength and muscle mass in older females (Nutrients, 2021) · meta-analysis
10 RCTs, n=211. Upper-body strength improved; lower-body strength only in trials lasting ≥24 weeks. No significant effect on muscle mass.
PMID 34836013 — read the article ↗
[2]
Creatine + resistance training on regional hypertrophy, by direct imaging (Nutrients, 2023) · meta-analysis
10 studies, MRI/CT/ultrasound. Effect on muscle thickness is real but VERY SMALL (0.10–0.16 cm), and smaller in older than younger adults.
PMID 37432300 — read the article ↗
[3]
Creatine and memory in healthy individuals (Nutrition Reviews, 2023) · meta-analysis
8 RCTs. Memory improved overall (SMD 0.29); the effect sits almost entirely in the 66–76 age group, not in the young.
PMID 35984306 — read the article ↗

See all studies on PubMed ↗

Mechanism

Raises intramuscular phosphocreatine, buffering rapid ATP resynthesis during short, intense effort; may also support cellular bioenergetics in brain and other high-demand tissues.

Safety

Among the most-studied supplements in existence and well tolerated in healthy people at standard doses. The common fears (kidney damage, dehydration, cramping) are not supported by evidence in those with normal kidney function. People with kidney disease should check with a clinician. A small amount of early water retention is normal and harmless.

Dosage context

Typical protocols use ~3–5 g/day of creatine monohydrate, with or without an initial higher-dose 'loading' week. Monohydrate is the best-evidenced and cheapest form; more exotic forms rarely justify their price.

Examples of application

Added as ~3–5 g/day of plain monohydrate in water or a shake.
Paired with resistance training, where its evidence is strongest.
Kept simple: monohydrate rather than pricier 'advanced' forms.

From the field

In a market full of hype, creatine is almost the opposite problem: cheap, unglamorous, and better evidenced than most 'longevity' molecules. We grade it B for functional aging and stay clear that it isn't a lifespan drug.

Where to buy

Price and availability comparison across sellers operating in Italy. Prices are indicative — always verify on the seller's site.

Seller	Price	Shipping	Total	Unit price	Cost/studied dose	Updated
Amazon.it ProFuel Creatina monoidrata micronizzata 1 kg	€17.95	to verify	n/a	€1.80 /100 g	€0.102	2026-08-26	Go to store →
Amazon.it Yamamoto Creatine PRO Creapure 500 g	€42.69	to verify	n/a	€8.54 /100 g	€0.484	2026-08-26	Go to store →

Cost per studied dose is computed only where the entry declares a cited dose and the label declares mg per serving. Where either is missing the column stays empty rather than estimating. Nucleo may earn a commission when you buy through some links. The commission does not raise your price and does not influence the ranking. The comparison is not exhaustive. How the comparison works.

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