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Tirzepatide activates two hormone pathways called GIP and GLP-1. In simple terms, these signals help the body respond to food by improving insulin release when glucose is high, reducing hunger, and slowing how quickly food leaves the stomach. Researchers study how those effects influence blood sugar, appetite, and body weight.

Retatrutide activates GLP-1, GIP, and glucagon receptors. The GLP-1 and GIP signals are studied for appetite, fullness, digestion, and insulin response. The glucagon pathway is also being studied for its effect on how the body uses stored energy. Researchers are testing whether combining all three signals can create a broader effect on body weight and metabolic health.

Cagrilintide is designed to act like amylin, a hormone released after eating. Amylin helps tell the brain that enough food has been consumed and also affects how quickly food moves through the stomach. Researchers study whether a longer-lasting amylin signal can reduce food intake and support body-weight research.

MOTS-c is a small peptide produced from mitochondrial genetic material. Mitochondria are the parts of cells that help turn nutrients into usable energy. Researchers are studying whether MOTS-c helps cells adapt to metabolic stress and influences glucose use, energy balance, and age-related changes. Most evidence remains early or preclinical.

Tesamorelin is a laboratory-made version of growth hormone-releasing hormone. Instead of being growth hormone itself, it signals the pituitary gland to release more of the body’s own growth hormone. Researchers study its effects on growth-hormone patterns, IGF-1, fat distribution, and body composition.

Human growth hormone is a signaling protein made by the pituitary gland. Researchers use it to study growth, protein production, bone turnover, tissue development, and the way the body divides nutrients between fat and lean tissue. The purpose of this research is to better understand normal and abnormal growth-hormone physiology.

IGF-1 LR3 is a modified form of insulin-like growth factor 1 designed to remain active longer in laboratory models. IGF-1 is part of the growth-hormone pathway and sends signals related to cell growth, protein production, and nutrient use. Researchers use LR3 mainly to examine IGF receptor signaling in cell and animal studies; it is not the same as approved medical IGF-1 products.

NAD+ is a molecule found in every living cell. It helps enzymes turn food into cellular energy and also participates in DNA repair and stress-response pathways. Researchers study how NAD+ levels change with aging, illness, and metabolic stress, and whether changing NAD+ availability alters those processes.

BPC-157 is a synthetic peptide studied mainly in laboratory and animal models. Researchers have looked at blood-vessel signaling, inflammation, and repair responses in tendons, muscles, nerves, and the digestive system. The goal is to understand possible repair mechanisms, but reliable human clinical evidence is very limited.

TB-500 is associated with research on thymosin beta-4, a naturally occurring protein involved in cell movement and wound repair. Scientists study how this pathway affects actin, the internal framework cells use to move and change shape, along with new blood-vessel formation and tissue remodeling.

GHK-Cu is a naturally occurring peptide that carries copper. Researchers study how it interacts with genes and enzymes involved in collagen, extracellular matrix remodeling, antioxidant defense, wound repair, and hair-follicle biology. Much of the work is laboratory, animal, or topical research.

GLOW is a trade name rather than one universally defined peptide. Its research purpose depends entirely on the ingredients and amounts in the specific blend. A responsible study would evaluate each listed component separately, then examine whether the combination changes collagen signaling, tissue remodeling, oxidative stress, or repair markers. The exact composition should always be disclosed with the product.

Selank is a synthetic peptide related to tuftsin. Researchers have examined its effects on stress behavior, learning, memory, and neurotransmitter systems such as GABA and serotonin. The purpose is to understand how short peptides may influence brain signaling, but the available evidence is limited and much of it comes from small or non-U.S. studies.

Delta sleep-inducing peptide was identified during sleep-related experiments. Researchers have explored possible effects on sleep patterns, stress hormones, pain signaling, and circadian biology. Findings have been inconsistent, so current research is more about understanding the peptide’s biology than treating sleep problems.

Cerebrolysin is a mixture of small peptides derived from porcine brain proteins. Researchers study whether it affects nerve-cell survival, connections between neurons, and recovery after neurological injury. It has been studied in stroke, brain injury, and cognitive disorders, but results and clinical acceptance vary by condition and country.

PT-141, also called bremelanotide, activates melanocortin receptors in the central nervous system. Unlike drugs that mainly alter local blood flow, this pathway is studied for how the brain regulates sexual interest and arousal. Researchers use it to understand melanocortin signaling and neuroendocrine behavior.

Melanotan II is a synthetic melanocortin-receptor agonist. Researchers study how melanocortin signaling affects melanin production, skin pigmentation, appetite, and other nervous-system responses. Because it can activate more than one receptor subtype, research also examines off-target effects and safety concerns.

Thymosin alpha-1 is a peptide involved in immune regulation. Researchers study how it influences T cells, dendritic cells, pattern-recognition pathways, and communication between parts of the immune system. The purpose is to understand immune balance during infection, inflammation, and immune suppression.

Bacteriostatic water is a sterile laboratory diluent containing a preservative. It is not a peptide and has no research effect by itself. Its role in a laboratory is to serve as a controlled liquid medium when a validated protocol specifically calls for it. Compatibility, sterility, storage, and disposal must be determined by the laboratory’s procedures.

Researchers study activation of PPAR-delta and its effects on fatty-acid use, endurance-related metabolism, and gene expression. Human safety has not been established.

This combination is studied for two different energy pathways: exercise-mimetic signaling and mitochondrial uncoupling. Research focuses on metabolic output and safety margins.

Tesofensine is studied for effects on dopamine, norepinephrine, and serotonin transporters, with research measuring appetite, body weight, cardiovascular markers, and tolerability.

Orforglipron is a non-peptide oral GLP-1 receptor agonist studied for glucose regulation, appetite, gastric emptying, and body-weight outcomes.

Researchers study these peptides for separate effects involving blood-vessel signaling, cell movement, inflammation, and tissue-repair models. Evidence is mainly laboratory and animal based.

KPV is a short peptide fragment studied for inflammatory signaling, epithelial barrier function, and tissue-response models.

SLU-PP-332 is studied as an estrogen-related receptor agonist that may alter oxidative metabolism and endurance-related gene programs in laboratory models.

LGD-4033 is a selective androgen receptor modulator studied for effects on lean-mass biology, hormone markers, lipids, liver enzymes, and other safety outcomes.