{"id":80718,"date":"2026-07-08T00:23:07","date_gmt":"2026-07-08T04:23:07","guid":{"rendered":"https:\/\/world.edu\/?p=80718"},"modified":"2026-07-08T00:23:07","modified_gmt":"2026-07-08T04:23:07","slug":"what-are-peptides-and-why-am-i-hearing-so-much-about-them","status":"publish","type":"post","link":"https:\/\/world.edu\/what-are-peptides-and-why-am-i-hearing-so-much-about-them\/","title":{"rendered":"What are peptides? And why am I hearing so much about them?"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-large\" src=\"https:\/\/world.edu\/wp-content\/uploads\/2026\/07\/peptides-1.jpg\" width=\"680\" height=\"453\" \/><\/p>\n<p>Peptide may not yet be the 2026 Oxford Word of the Year, but it must surely be in the running.<\/p>\n<p>From your friendly neighbourhood influencer, to the\u00a0<a href=\"https:\/\/theconversation.com\/get-big-or-die-trying-social-media-is-driving-mens-use-of-steroids-heres-how-to-mitigate-the-risks-253110\">gym bros<\/a>, injectable peptides have been all over social media and are now making mainstream news when things go horribly wrong.<\/p>\n<p>People are taking them, and promoting them, for a seemingly endless list of reasons. Depending on who you ask, they\u2019ll either put a pep in your step, give you a tan, make your skin glow, or even build you bigger muscles.<\/p>\n<p>But for those of us not immersed in this new form of chemical pop culture, what the heck are they?<\/p>\n<h4><strong>They\u2019re chemical messengers<\/strong><\/h4>\n<p>Many peptides occur naturally in the body (endogenous), or in the food we eat (exogenous). These short chains of amino acids are\u00a0<a href=\"https:\/\/www.genome.gov\/genetics-glossary\/Peptide\">smaller than proteins<\/a>\u00a0and are entirely natural.<\/p>\n<p>However, the peptides created in labs for varied purposes are\u00a0<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC3564544\/\">synthetic<\/a>.<\/p>\n<p>Within the body,\u00a0<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC12265896\/\">peptides act<\/a>\u00a0as precision chemical messengers regulating critical processes such as metabolism, growth, immunity, and\u00a0<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11426299\/\">tissue repair and building<\/a>.<\/p>\n<p>They are water-soluble, so they cannot pass directly through cell membranes. Instead, they bind to receptors on the surface of target cells to trigger a cascade of events inside the cell.<\/p>\n<p>Some key categories of peptides include:<\/p>\n<ul>\n<li>peptide hormones (such as\u00a0<a href=\"https:\/\/www.tga.gov.au\/news\/blog\/too-much-good-thing-health-risks-human-growth-hormone\">human growth hormone<\/a>). These regulate metabolism, growth and other whole-body processes<\/li>\n<li>neuropeptides (endorphins). These signal within the brain and nervous system to influence things such as mood, appetite and pain<\/li>\n<li>growth factors (IGF-1). These stimulate cells to grow, divide and repair<\/li>\n<li>immune modulators (thymosin alpha-1). These tune or dampen the immune response.<\/li>\n<\/ul>\n<h4><strong>Some commonly used medicines are peptides<\/strong><\/h4>\n<p>Some peptide medicines are familiar and legitimate:\u00a0<a href=\"https:\/\/www.ama-assn.org\/public-health\/prevention-wellness\/what-doctors-want-patients-know-about-injectable-peptides\">insulin<\/a>, for example, is a peptide hormone with a long history of clinical use.<\/p>\n<p>People are now taking peptides for a variety of reasons, including weight loss \u2013 such as with\u00a0<a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC4119845\/\">glucagon-like peptide-1<\/a>\u00a0(GLP-1) receptor agonists which suppress hunger and slow down the functioning of the stomach.<\/p>\n<p>These peptides have become commonly prescribed for diabetes control or weight loss.<\/p>\n<h4><strong>Others are used for \u2018optimisation\u2019<\/strong><\/h4>\n<p>The\u00a0<a href=\"https:\/\/www.npr.org\/2026\/02\/23\/nx-s1-5716162\/peptides-science-muscle-growth-longevity-wellness\">recent boom<\/a>\u00a0in peptide talk and use is\u00a0<a href=\"https:\/\/www.theguardian.com\/wellness\/2026\/feb\/05\/injectable-peptides-trend\">mostly for<\/a>\u00a0products promoted online for more efficient weight loss, muscle growth, injury recovery, tanning, anti-ageing, libido, energy, or \u201coptimisation\u201d (the quest for a better you).<\/p>\n<p>Most people using these products aren\u2019t injecting into a vein. Peptides are typically injected just under the skin (subcutaneously) using smaller insulin-style needles into the\u00a0<a href=\"https:\/\/doi.org\/10.1111\/dar.70044\">abdomen, thigh or upper arm<\/a>.<\/p>\n<p>Others are available as nasal sprays, tablets or creams. But injection is the\u00a0<a href=\"https:\/\/doi.org\/10.1016\/S2352-4642(26)00099-4\">most common route<\/a>\u00a0for the enhancement peptides promoted online.<\/p>\n<p>This peptide surge is just one aspect in a much broader push toward human \u201cenhancement\u201d, where the line between treating illness and enhancing a healthy body keeps blurring. Social media is being used to\u00a0<a href=\"https:\/\/www.theatlantic.com\/culture\/2026\/05\/enhanced-games-sports-doping\/687296\/\">normalise enhancement substances<\/a>, including peptides, well beyond elite sport.<\/p>\n<p>However, because there is no routine surveillance of peptide use in Australia, we don\u2019t yet know which peptides are most commonly used or how patterns of use are changing over time.<\/p>\n<h4><strong>How are peptides regulated?<\/strong><\/h4>\n<p>In Australia, peptide products used for therapeutic purposes are\u00a0<a href=\"https:\/\/www.tga.gov.au\/safety\/safety-monitoring-and-information\/safety-alerts\/understanding-your-responsibilities-when-importing-compounding-and-supplying-unapproved-peptide-products\">regulated as therapeutic goods<\/a>.<\/p>\n<p>Many of the products now\u00a0<a href=\"https:\/\/theconversation.com\/influencers-are-promoting-dangerous-peptides-on-social-media-and-regulators-are-struggling-to-keep-up-282905\">being advertised or sold online<\/a>\u00a0are\u00a0<a href=\"https:\/\/www.tga.gov.au\/news\/media-releases\/concerns-regarding-public-health-risks-associated-unapproved-peptide-products\">not approved<\/a>\u00a0by the Therapeutic Goods Administration (TGA), meaning they haven\u2019t been assessed for safety, quality or effectiveness. This includes BPC-157 (promoted for injury and gut recovery),\u00a0<a href=\"https:\/\/theconversation.com\/will-retatrutide-help-me-lose-weight-or-look-shredded-280580\">retatrutide (an experimental weight-loss<\/a>\u00a0and diabetes drug), GHK-Cu (promoted for skin and anti-ageing), TB-500 (promoted for injury recovery) and CJC-1295 (promoted for muscle growth).<\/p>\n<p>Without\u00a0<a href=\"https:\/\/www.tga.gov.au\/news\/media-releases\/concerns-regarding-public-health-risks-associated-unapproved-peptide-products\">TGA approval<\/a>, importing or supplying them for human use without authorisation is against the law.<\/p>\n<p>However, people are still\u00a0<a href=\"https:\/\/doi.org\/10.1016\/S2352-4642(26)00099-4\">accessing these substances<\/a>, mostly via online vendors. Social media is crucial to this market and driving sales. Influencers push referral links and promote products by injecting them online and telling people how they will make their skin glow.<\/p>\n<p>A key loophole suppliers use to sell these substances\u00a0<a href=\"https:\/\/doi.org\/10.1001\/jama.2026.10690\">in the United States<\/a>\u00a0is labelling them as \u201cresearch chemicals\u201d or for \u201cresearch use only\u201d. But this does not mean these substances are legal or safe for human use. Nor does it apply in Australia.<\/p>\n<h4><strong>What are the risks?<\/strong><\/h4>\n<p>The biggest risk isn\u2019t always the peptide itself. Enhancement products sold online\u00a0<a href=\"https:\/\/doi.org\/10.1111\/add.70009\">may contain<\/a>\u00a0much more \u2013 or much less \u2013 of the advertised ingredient than the label claims.<\/p>\n<p>Our\u00a0<a href=\"https:\/\/www.abc.net.au\/news\/2026-06-27\/double-strength-retatrutide-peptide-sparks-warning\/106844372\">recent laboratory testing<\/a>\u00a0of retatrutide found doses almost double the labelled amount.<\/p>\n<p>Other products\u00a0<a href=\"https:\/\/doi.org\/10.1111\/dar.70007\">may contain<\/a>\u00a0impurities,\u00a0<a href=\"https:\/\/theconversation.com\/pumped-up-with-poison-new-research-shows-many-anabolic-steroids-contain-toxic-metals-261470\">contaminants<\/a>\u00a0or entirely different substances.<\/p>\n<p>Even a correctly labelled, uncontaminated product carries risk. Most enhancement peptides have little or no human trial data, so their effects and safety in otherwise healthy people are largely unknown.<\/p>\n<p>Injecting itself introduces risks of infection, abscesses and scarring, as well as blood-borne viruses if equipment is shared.<\/p>\n<p>Many people using enhancement drugs such as peptides also don\u2019t disclose their use to health and drug services, meaning they may\u00a0<a href=\"https:\/\/doi.org\/10.1111\/add.70395\">miss out<\/a>\u00a0on harm-reduction advice, sterile injecting equipment and accurate health information.<\/p>\n<p><em><strong>Author Bios: <\/strong>Samuel Cornell is an Honorary Research Fellow in Public Health and Timothy Piatkowski is a Senior Research Fellow in Public Health, both at The University of Queensland<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Peptide may not yet be the 2026 Oxford Word of the Year, but it must surely be in the running. From your friendly neighbourhood influencer, to the\u00a0gym bros, injectable peptides have been all over social media and are now making mainstream news when things go horribly wrong. People are taking them, and promoting them, for [&hellip;]\n&hellip; <a href=\"https:\/\/world.edu\/what-are-peptides-and-why-am-i-hearing-so-much-about-them\/\" class=\"more\">learn more&rarr;<\/a><\/p>","protected":false},"author":33,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[109017],"tags":[435719],"coauthors":[11733],"class_list":["post-80718","post","type-post","status-publish","format-standard","hentry","category-health-care","tag-peptides"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are peptides? 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