When insulin is present, it helps blood vessels in muscles relax, letting more blood flow in. This brings more creatine to the muscle surface, where it can be absorbed.
Evidence from Studies
Supporting (6)
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Insulin-mediated skeletal muscle vasodilation is nitric oxide dependent. A novel action of insulin to increase nitric oxide release.
The study shows insulin helps widen blood vessels in muscle by increasing nitric oxide, which boosts blood flow—just like the claim says. But it doesn’t test whether this actually helps deliver more creatine to muscle cells.
Insulin-mediated muscle microvascular perfusion and its phenotypic predictors in humans
The study shows that insulin increases blood flow in muscle, which helps deliver nutrients. This supports the idea that insulin improves delivery of substances like creatine, even if it doesn’t prove exactly how or where.
Endothelial insulin resistance induced by adrenomedullin mediates obesity-associated diabetes.
The study shows that insulin helps widen blood vessels in muscle using nitric oxide, which improves blood flow—this supports part of the claim. It doesn’t test creatine directly, but the blood flow part is backed by the evidence.
109-OR: GIP Acutely Blunts Insulin- and GLP-1–Induced Muscle Microvascular Perfusion
The study shows insulin increases blood flow to muscles, which supports the idea that it helps deliver substances like creatine. However, it doesn’t directly test creatine or its transporters.
The study shows that insulin helps widen blood vessels in muscle by using nitric oxide, which increases blood flow—this part matches the claim. But it doesn’t test whether this helps deliver more creatine to muscles.
In humans, insulin makes blood vessels widen by releasing nitric oxide — this is exactly how it helps deliver creatine to muscle cells.
Contradicting (1)
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Insulin-Stimulated Myocardial Glucose Uptake and the Relation to Perfusion and the Nitric Oxide System
The study looked at how insulin affects blood flow and glucose in the heart, not creatine in muscles, and found blood flow didn't increase with insulin. This doesn't support the idea that insulin helps deliver creatine to muscles by increasing blood flow.
Gold Standard Evidence Needed
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