Image credits

Images on this site, including those in lists and link previews:

• Dense connective tissue: Echinaceapallida, CC BY-SA 4.0. Cropped and recolored.
• Pine stem: Theofilus Christian, CC BY-SA 4.0. Cropped and recolored.
• Skeletal muscle fibers: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Skin layers: Kilbad and Mikael Häggström, CC0. Cropped and recolored.
• Fat tissue: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Stomach lining: Nephron, CC BY-SA 3.0. Cropped and recolored.
• Small intestine tissue: Mikael Häggström, CC0. Cropped and recolored.
• Pancreas tissue: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Gut lining: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Tulip tree stem: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Pipevine stem: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Native copper: Darla Sondrol, Geoscience Digital Image Library, CC0. Cropped and recolored.
• Loose connective tissue: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Hyaline cartilage: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Squash stem: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Water lily leaf: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.
• Geranium stem: Berkshire Community College Bioscience Image Library, CC0. Cropped and recolored.

Our edited versions of the CC BY-SA images are shared under the same licenses.

These images are illustrations. They don’t come from the studies in our guides, and they aren’t evidence that a peptide works.

These credits do not mean that any photographer or institution endorses this site or its reporting.