Best Peptides for Anxiety

Selank is a synthetic seven-amino-acid peptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) built from the natural immune peptide tuftsin, with a small chemical tweak to make it last longer in the body. It was developed in Russia as an anti-anxiety and nootropic agent and is approved there for generalized anxiety disorder, but it has no FDA or EMA approval and almost no Western clinical data. The pitch is calm and focus without the sedation, dependence, or withdrawal that come with benzodiazepines.

DSIP, or delta sleep-inducing peptide, is a small naturally occurring nonapeptide (sequence Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) first isolated in the 1970s from the blood of sleeping rabbits. As the name suggests, it was named for its ability to promote delta-wave (deep, slow-wave) sleep in animals. Despite five decades of study it has no regulatory approval and the human evidence for it as a sleep aid is weak and inconsistent.

GB-115 is a synthetic dipeptide anxiolytic developed in Russia, chemically the amide of N-phenylhexanoyl-glycyl-L-tryptophan and described as a retro-analogue of cholecystokinin-4. Rather than acting like a benzodiazepine, it blocks cholecystokinin receptors, a different anti-anxiety route. It has been studied in animals and in a small pilot human study, but it is not an approved or widely available medication.

PE-22-28 is a seven-amino-acid peptide that blocks a potassium channel in the brain called TREK-1, the same target tied to depression. It is a shortened, more potent and more stable version of spadin, a natural fragment cut from the sortilin propeptide, and it was built to act like a fast antidepressant. All evidence is from rodents. There are no human clinical trials.

Semax is a synthetic heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro) developed in Russia in the 1980s as an analog of the ACTH(4-10) fragment, with a Pro-Gly-Pro tail added to resist breakdown. It is researched and used as a neuroprotective and nootropic agent, typically intranasally, and keeps the cognitive and neurotrophic effects of the ACTH fragment without the parent hormone's cortisol-raising activity. It is used clinically and registered in Russia (including for ischemic stroke and cognitive disorders) but is not approved by the FDA or EMA, and Western evidence is limited.

MOTS-c is a 16-amino-acid peptide your own mitochondria make, encoded inside the 12S rRNA region of mitochondrial DNA and discovered in 2015. It is studied as a metabolic regulator and a so-called exercise mimetic, because its levels rise when you work out and it improves insulin sensitivity in animals. The catch: the impressive results are almost entirely in mice, with no completed published human efficacy trials.

Humanin is a 24-amino-acid peptide encoded inside mitochondrial DNA (in the 16S rRNA gene), discovered in 2001 and named for its ability to protect human neurons from Alzheimer-related cell death. It was the first member of the mitochondrial-derived peptide family and is studied mainly for neuroprotection, cell survival, and metabolic and age-related disease. The honest status: it has the deepest preclinical evidence base of any mitochondrial peptide, but human therapeutic trials are essentially absent.

NAD+ precursors are not peptides. They are small molecules, mainly nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN), that the body converts into NAD+, a coenzyme every cell needs to make energy and run repair enzymes. NAD+ falls with age, so these precursors are sold as anti-aging and metabolic supplements. Human trials confirm they reliably raise blood NAD+ levels, but clear proof of real health benefits in people is still missing.

Pinealon is a synthetic tripeptide, Glu-Asp-Arg (the EDR peptide), from the Russian peptide-bioregulator family designed to mimic short signaling peptides found in brain tissue. It is studied as a neuroprotective and antioxidant compound, with researchers proposing it protects neurons from oxidative stress and supports cognition. Be clear-eyed about the evidence: it is essentially all cell-culture and animal work from a small set of related labs, with no human clinical trials and no regulatory approval.

Thymosin beta-4 (Tbeta4) is a small 43 amino acid peptide found in nearly every cell in the body, originally isolated from the thymus. Its main job is binding and sequestering G-actin, the building block of the cell's internal scaffolding, which lets it influence cell movement, wound repair, and tissue regeneration. It is researched heavily for healing of skin, cornea, and heart tissue, but it is not an FDA-approved drug. (The injectable sold as TB-500 is a synthetic fragment marketed as related to Tbeta4, not the full natural peptide.)

Chonluten is a synthetic tripeptide (Glu-Asp-Gly, EDG) from the Khavinson bioregulator family, pitched as the lung and bronchial peptide, derived conceptually from the same program that produced Epitalon and Cortagen. It is researched for respiratory tissue and age-related lung decline, and it has no FDA or EMA approval. The evidence is essentially all preclinical or uncontrolled Russian clinical observation, with no randomized human trials.

Glutathione is the body's main intracellular antioxidant, a tripeptide of glutamate, cysteine, and glycine (often written GSH). It is sold as oral, IV, topical, and inhaled products and marketed for everything from detox and immune support to skin lightening, but its real, evidence-backed role is as a redox buffer that neutralizes oxidative stress and supports liver detoxification. Some clinical evidence exists for specific uses, while many popular claims, especially IV skin whitening, rest on weak or risky data.