Peptide Academy · Approved peptides · Education only
Insulin and insulin analogues: What FDA Approved, Explained Simply
By BioLabs Research · Peptide Academy › Approved Peptides
Insulin is the peptide that made modern peptide medicine possible. Today there are many approved insulins, and most are 'analogues': insulin with a few amino acids changed on purpose.
On this page we'll keep it simple: what insulin is, what it does according to the official FDA label, and exactly what FDA approved. Nothing here is advice on using a medicine. Approved medicines are prescribed by licensed clinicians, and the official label is always the controlling text.
What it is
Human insulin is a 51-amino-acid peptide hormone made by the pancreas, built from two chains linked together. Insulin analogues swap or add a few amino acids so that the molecule is absorbed faster or slower, giving rapid-acting and long-acting versions. Insulin products appear in Drugs@FDA under BLA numbers, meaning they are regulated as biological products.
What it does
Section 12.1 of the insulin glargine label explains that insulin's primary activity is regulating glucose metabolism. Insulin and its analogues lower blood glucose by stimulating glucose uptake into skeletal muscle and fat and by inhibiting glucose production in the liver. Insulin also inhibits the breakdown of fat (lipolysis) and protein (proteolysis), and enhances protein synthesis.
For a deeper dive, see the peer-reviewed review: Curr Med Res Opin 2002 — 'Insulin analogues' (PubMed 12365818).
What FDA approved
Labelled indication: Example (insulin glargine, BLA 021081): to improve glycemic control in adult and pediatric patients with diabetes mellitus; not recommended for diabetic ketoacidosis. Other insulin products have their own labelled populations.
Inhaled insulin (BLA 022472) carries a boxed warning for risk of acute bronchospasm in patients with chronic lung disease such as asthma or COPD.
Regulatory status at a glance
| Item | Status | Source |
|---|---|---|
| Application | BLA 021081 (insulin glargine, example) | Drugs@FDA |
| Original approval date | Varies by product; Drugs@FDA now lists insulin products as BLAs (biologics) | openFDA |
| Labelled indication | As quoted above | DailyMed |
| Boxed warning | None for insulin glargine (BLA 021081); boxed warning for inhaled insulin (BLA 022472) | DailyMed |
| 503A bulks list | Not applicable: this is an FDA-approved product | — |
A common misunderstanding
People often say 'insulin' as if it were one product. Drugs@FDA lists many separate insulin products, each with its own application and label.
What FDA approval actually means
Here's the part most people get wrong. FDA approval is narrow. It covers a specific product, from a specific manufacturer, for a specific use, in a specific group of patients, with a specific label. The approval does not belong to the molecule floating around in the world. A chemical with the same name, sold by someone else for any other purpose, is not an approved drug. That's why we quote the label's own indication and nothing more.
How we checked these facts
Every regulatory fact on this page comes from an official U.S. government source: the Drugs@FDA database (and its openFDA API) for the application number and approval date, and the current FDA label on DailyMed for the indication, boxed warning and mechanism. Mechanism background also comes from a peer-reviewed review indexed in PubMed. We don't reproduce usage instructions from labels. This is an education page, not a guide to using any medicine.
Why approved peptides matter for peptide science
Approved peptides prove that peptide research can turn into real medicines. They also show how high the bar is: controlled human trials, manufacturing inspections, a written label, and safety monitoring that continues after approval. Most peptides you read about online never got anywhere near that bar. Chapter 7 of the Academy explains where the line sits.
FAQ
Why are insulins listed as BLAs?
Drugs@FDA lists insulin products under Biologics License Applications, meaning they are regulated as biological products.
What is an insulin analogue?
Insulin with a few amino acids deliberately changed to alter how fast or how long it acts.
Is this page medical advice?
No. It is education only. Talk to a licensed healthcare professional about any medicine.
References: Drugs@FDA; openFDA; DailyMed label; PubMed review; DailyMed label, inhaled insulin.