The Claim

Oral citrulline supplementation has no effect on plasma concentrations of insulin or IGF-1 in adults with short bowel syndrome.

Source: Effect of oral citrulline supplementation on whole body protein metabolism in adult patients with short bowel syndrome: A pilot, randomized, double-blind, cross-over study.

What the research says

Supports is higher

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

Supports
58score
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.

Description
1 study reviewed
In plain English

Taking citrulline by mouth does not change the levels of insulin or IGF-1 in the blood of adults with short bowel syndrome.

See the scientific wording

Oral citrulline supplementation does not affect insulin or IGF-1 plasma concentrations in adults with short bowel syndrome, indicating that its potential metabolic effects are not mediated through these anabolic hormonal pathways.

Why this might work

Citrulline is converted into arginine in the kidneys, which then supports the production of nitric oxide and other molecules that directly stimulate muscle protein building without needing insulin or IGF-1 to signal the process.

Supported mechanismbased on 1 study

What the research says

1 study

  1. Study: Effect of oral citrulline supplementation on whole body protein metabolism in adult patients with short bowel syndrome: A pilot, randomized, double-blind, cross-over study.

    This study gave people with short bowel syndrome citrulline pills and checked their insulin and IGF-1 hormone levels before and after. The levels didn’t change, so citrulline isn’t working through these hormones to affect the body—meaning it must work some other way.

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.