The Claim

Creatine supplementation combined with resistance training produces a small but statistically probable increase in muscle thickness of the upper body (0.10–0.16 cm) and lower body (0.11–0.13 cm), with no meaningful difference between muscle groups, suggesting uniform regional effects across limbs.

Source: The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
53score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

When people take creatine and do resistance training, their upper and lower body muscles become slightly thicker by specific measurable amounts, with no significant difference in thickness between upper and lower body muscles.

See the scientific wording

Creatine supplementation combined with resistance training produces a small but statistically probable increase in muscle thickness of the upper body (0.10–0.16 cm) and lower body (0.11–0.13 cm), with no meaningful difference between muscle groups, suggesting uniform regional effects across limbs.

Why this might work

Taking creatine lets muscle cells store more energy, so they can work harder during weight training. This extra effort stretches and stresses the muscle fibers more, which signals the cells to build more protein and grow thicker. Creatine also pulls water into the muscle cells, making them swell, which further tells the cells to make more protein and not break down as much. This happens the same way in arms and legs, so both areas get a little thicker.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis

    When people take creatine and lift weights, their muscles get a tiny bit thicker—about the width of a paperclip—in both their arms and legs, and it doesn’t matter much which muscles you train. Not everyone responds, but on average, it helps a little.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.