Source: Magnific.com 

Peptides are short chains of amino acids linked by peptide bonds. They come in major types—each serving distinct clinical, cosmetic, or laboratory functions. 

Here’s a breakdown of the major types of peptides, where they are derived from, and what benefits each offers. Let’s review each of them in detail… 

1. Research Use Only (RUO) Peptides

What RUO Means

Research Use Only (RUO) is a mandatory regulatory and labeling designation indicating that a chemical compound is strictly intended for in vitro laboratory experiments, cell culture work, or preclinical animal studies. 

Research peptides are not cleared, evaluated, or approved by regulatory bodies (such as the FDA) for human consumption, therapeutic use, or clinical diagnosis.

Common Compounds Sold as RUO Peptides and Their Laboratory Focus

BPC-157: Derived from a gastric protein; heavily studied in vitro for cellular migration, angiogenesis, and soft-tissue/tendon repair models.

TB-500: A synthetic fragment of Thymosin Beta-4 explored in laboratory settings for actin-sequestration and cellular regeneration pathways.

CJC-1295 & Ipamorelin: Growth hormone secretagogues studied in laboratory frameworks regarding pituitary stimulation and peptide-receptor binding dynamics.

MOTS-c: A mitochondrial-derived peptide investigated for its theoretical impact on metabolic homeostasis and cellular stress response.

Selank & Semax: Neuropeptide analogs researched primarily in neurobiology for cognitive performance and antioxidant defense mechanisms in neural tissue.

2. Major Biological and Functional Types

Therapeutic Peptides (FDA-Approved Drugs)

Semaglutide / Liraglutide: GLP-1 receptor agonists used for type 2 diabetes management and long-term weight regulation.

Insulin: A foundational polypeptide hormone used to control blood glucose levels in diabetes.

Tirzepatide: A dual GLP-1/GIP receptor agonist targeting metabolic pathways and glucose-dependent insulinotropic stimulation.

Enfuvirtide: A biomimetic fusion inhibitor used as an antiretroviral medication for HIV treatment.

Skincare and Cosmetic Peptides

Signal Peptides (e.g., Matrixyl): Stimulate dermal fibroblasts to produce structural proteins like collagen and elastin.

Carrier Peptides (e.g., Copper Peptides / GHK-Cu): Deliver trace elements like copper to support enzymatic wound healing and extracellular matrix synthesis.

Neurotransmitter Peptides (e.g., Acetyl Hexapeptide-8): Interfere with complex neuromuscular signaling pathways to temporarily minimize expression lines.

Endocrine and Neuropeptide Regulators

Oxytocin: Regulates smooth muscle contraction during reproductive processes and mediates social bonding.

Endorphins: Endogenous neuropeptides that act on the central nervous system to modulate pain perception and stress.

Key Takeaways 

Peptides are sequences of amino acids that typically consist of 2 to 100 units. The body produces peptides that play crucial roles in various essential functions within your physiological processes, including 

• how food digests,
• how energy is used from the food you eat, 
• how hungry you feel, 
• how your hormones work, and 
• how cells move throughout the body. 

Peptides have been utilized in pharmaceuticals for approximately a century, and certain peptides are formulated into oral supplements as well as skin and hair care products that offer benefits for anti-aging, muscle development, and fat reduction.

One more type: research-use-only peptides are worth knowing about. As stated above, they are used for assay development, structural biology, pre-clinical models, and other lab research purposes; not for skincare, health, and medicinal purposes.  

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