insulin

Insulin is the peptide hormone that controls blood glucose and an essential diabetes medicine. Bodybuilders use it hoping to drive nutrients into muscle, but controlled human work shows less muscle-protein breakdown, not a continuing rise in muscle-protein synthesis.

tier F · growth hormone · 0 located controlled healthy-person physique trials

verdict

For diabetes, insulin is established and lifesaving. For muscle gain in healthy people, the reviewed PubMed and ClinicalTrials.gov searches found no controlled efficacy trial. Human mechanism studies show reduced protein breakdown, not unlimited synthesis, while severe hypoglycemia is immediate and documented.

the core tension

Insulin is essential diabetes medicine. The bodybuilding claim is a different question: controlled human mechanism studies show reduced protein breakdown, not a dose-driven rise in muscle-protein synthesis, and no controlled healthy-person muscle-gain trial was found.

what it is

Insulin is a peptide hormone and biologic medicine that regulates blood glucose. The regular human products in this record are recombinant human insulin. Inhaled human insulin and long-acting analogs are distinct products with their own routes, concentrations, and pharmacokinetics.

what it does

Insulin receptor signaling increases glucose uptake into skeletal muscle and fat and reduces glucose production by the liver. In controlled human experiments it also reduced muscle-protein breakdown. Raising insulin further did not keep increasing muscle-protein synthesis when amino-acid availability was controlled.

origin

Humulin R began the recombinant human-insulin era in the United States in 1982. Current product records include regular human insulin, inhaled human insulin, and long-acting analogs, all for diabetes rather than physique use.

does it work

For diabetes, yes. For healthy-person muscle gain, the reviewed PubMed and ClinicalTrials.gov searches found no controlled efficacy trial. Human mechanism studies show an anti-breakdown effect, but more insulin did not keep raising muscle-protein synthesis.

key facts

• molecular formula: C₂₅₇H₃₈₃N₆₅O₇₇S₆
• molecular weight: 5808 Da (label writes 5.808 kDa)
• amino acids: not stated in the sourced label records; section 11 gives the molecular formula instead
• half-life: product and route specific; the Humulin R label reports different apparent half-lives after subcutaneous and intravenous administration
• type: human insulin of recombinant DNA origin (rDNA)
• CAS: not in the sourced records (FDA UNII 1Y17CTI5SR; RxCUI 311033, 311034, 311036)
• 0 located controlled healthy-person physique trials
• 30 mU/l protein-breakdown effect reached its measured ceiling
• 0.6 mmol/l glucose in one published nonmedical case

frequently asked questions

What is insulin human?

Insulin human is recombinant human insulin, a peptide-hormone biologic used to control blood glucose in diabetes. Product form matters: regular human insulin, inhaled insulin human, and long-acting insulin analogs are not interchangeable records.

Does insulin build muscle in healthy people?

No controlled healthy-person muscle-gain trial was found in the reviewed PubMed and ClinicalTrials.gov searches. Controlled human mechanism studies found reduced muscle-protein breakdown, while raising insulin further did not keep increasing muscle-protein synthesis.

How is insulin administered?

The route depends on the exact product. Regular human insulin labels include subcutaneous use and supervised intravenous use. Afrezza is inhaled. Awiqli is a weekly subcutaneous analog. None of those routes is an approved physique protocol.

Is insulin FDA approved?

Yes, for diabetes. Current labels cover product-specific human insulin and analog products. No approved indication in this record is for hypertrophy, lean mass, or bodybuilding.

What are the major insulin risks?

Severe hypoglycemia can cause seizures, unconsciousness, or death. Insulin can also cause dangerous potassium shifts, concentration-related dosing errors, and repeated-injection site damage. Afrezza has a separate boxed warning for acute bronchospasm in chronic lung disease.

related peptides

• igf-1 lr3: the other F, and the other compound whose hypoglycemia risk comes from the insulin receptor
• hgh: the compound insulin travels with in these circles, and the one the 70 IU case was chasing
• mots-c: same WADA class, different subsection: S4.4.1 rather than S4.4.2
• semaglutide: the other end of glucose control, and an S on a question the board does grade

reptides grades the research record and cites the literature behind every call. research reference only; not medical advice.