SNAP-8, or Synaptosomal-associated protein 8, is a synthetic octapeptide believed to mimic certain functionalities of its larger counterpart, SNAP-25, a protein deemed integral to neurotransmitter release and muscle contraction.^[1] Constructed from eight amino acids, SNAP-8’s structure is designed with specific modifications: an acetylated N-terminus and an amidated C-terminus, culminating in the sequence Ac-Glu-Glu-Met-Gln-Arg-Arg-Ala-Asp-NH2. It is structurally similar to another peptide known as acetyl hexapeptide-3, which also reportedly mimics a fragment of SNAP-25 and inhibits its function, leading to similar anti-wrinkle potential. By adding two amino acids to the chain of acetyl hexapeptide-3, the resultant acetyl octapeptide further enriches the field of research compounds studying cell aging and skin cell rejuvenation.^[2]

The synthesis and manufacturing of SNAP-8 comprises a final freeze-drying step called lyophilization. Generally, the crystalline powder obtained due to freeze-drying is in the form of a polymorphous compound. It may be present in aggregates and show variation in the crystal size. However, this does not appear to lead to any chemical discrepancy in its composition. Extensive experimental studies have supported the homogeneity of this compound. The usual shelf life of SNAP-8 is posited to be at least 12 months, provided the compound is stored in a clean, cool, and dry place. If the compound is intended to be stored longer than a year, the temperature should be maintained at 4 degrees Celsius. This may extend the shelf life to approximately 18 months. Refrigeration of the SNAP-8 may potentially lead to its precipitation; however, this doesn’t appear to change the integrity of the compound.

Syn-AKE is a peptide, also known as tripeptide-3 or dipeptide diaminobutyroyl benzyl amide diacetate. Syn-AKE, a synthetic peptide ingredient, appears to mimic the actions of the Waglerin-1 peptide, which is 21 amino acids in length. Waglerin-1 functions primarily as a muscle relaxant by inhibiting the activity of acetylcholine at the neuromuscular junction, which may potentially result in reduced muscle contractions. Acetylcholine is a neurotransmitter considered essential for muscle movement, and its inhibition at the neuromuscular junction prevents the normal contraction signals from reaching muscles. In the development of Syn-AKE, researchers sought to synthesize a peptide that might potentially mimic this action. Thus, the peptide Syn-AKE was engineered to emulate the mechanism by which Waglerin-1 acts, but in a more selective manner. Researchers suggest Syn-AKE may act to reduce transmission between muscles and nerves, working similarly to botulinum toxin to relax muscles and thus reduce instances of creasing and wrinkle development along epidermal surfaces, as suggested in animal model research. The apparent reduction of this transmission appears to be reversible when triggered by Syn-AKE. Therefore its action is temporary.^[1] According to Pentapharm, “the Syn-AKE invokes its action by blocking the muscle nAChR in a reversible manner by blocking the ion channel. As a result, the Na+ uptake is substantially disturbed, and the muscles remain relaxed.”

Syn-Coll, otherwise known as Palmitoyl Tripeptide-5 or Tripeptide-5, is a synthetic peptide that was developed to enhance the production of type I collagen. It appears to repair damages caused by photo-aging, and Syn-Coll has also been suggested to support the regeneration of skin protein production, such as elastin or collagen. Syn-Coll (Palmitoyl Tripeptide-5) is the synthetic equivalent of Thrombospondin 1 (TSP-1). TSP-1 is an extracellular matrix protein and is found in the skin near collagen and elastin. Syn-Coll appears to mimic the functions of TSP-1, possibly aiding in the prevention of collagen degeneration via stimulating the release of TGF- induced by TSP-1.^[1] TGF-β is an essential growth factor potentially significant in preserving skin integrity and facilitating the development of skin structures, mainly through the promotion of collagen synthesis. Additionally, Syn-Coll, a synthetic peptide, has been the subject of extensive research in animal models and laboratory experiments. The findings tentatively indicate that Syn-Coll might enhance collagen production and potentially inhibit its degradation. The inhibition of collagen breakdown by Syn-Coll is possibly due to its ability to suppress the activity of matrix metalloproteinases (MMPs), including MMP1 and MMP3, which are enzymes studied for their role in the degradation of collagen in the skin. The peptide is palmitoylated, to potentially extend its bioavailability in experiments involving different skin tissue models.

Thyrotropin Releasing Hormone (TRH), often called Protirelin, is a small peptide hormone made of 3 amino acids and synthesized in the hypothalamus. The hormone is thought to function via binding to the thyrotropin-releasing hormone receptors TRH-1 and TRH-2. It was developed by researchers with the intention to stimulate the release of both thyroid-stimulating hormone (TSH) and prolactin from the anterior pituitary. TSH, in turn, acts directly on the thyroid gland to promote the synthesis and release of thyroid hormones, primarily triiodothyronine (T3) and thyroxine (T4). TRH has been employed in the study of anterior pituitary gland function in models of thyroid disorders. TRH may exhibit potential roles in TREK-1 channel, in the regulation of cellular aging, arousal, feeding behaviors, autonomic regulation, and mitigating free radical damage.

Tripeptide-29 is a peptide that is one of the basic monomers of collagen. Collagen is a long-chain polymer composed of short monomers made of three consecutive amino acids. These monomers combine to form a secondary structure, which then may form tertiary and even quaternary structures. These complex structures may have many potential emergent properties. For example, most collagen molecules are thought to play roles in providing structural integrity and elasticity to the cellular complexes in tissues like the stratum corneum, tendons, and bones.

Collagen subunits most often follow the pattern of Gly-Pro-X, Gly-Xo-X, or Gly-X-Hyp. Tripeptide-29 is a GlyPro Hyp peptide, a complete synthetic analog of common collagen building blocks. Beyond its proposed involvement in collagen synthesis, researchers speculate that Tripeptide-29 may have additional biological implications. For instance, some preliminary studies suggest it may act as an antioxidant, potentially aiding in the protection of cells against oxidative stress, which is the imbalance between free radicals and antioxidants that may lead to cellular damage.

It is hypothesized that Tripeptide-29 might exhibit anti-inflammatory properties, possibly reducing inflammation; anti-fibrotic actions, which may help mitigate excessive formation of fibrous connective tissue; and anti-melanogenic characteristics, potentially influencing melanin production and affecting pigmentation processes in the dermal and epidermal layer.

Triptorelin is a synthetic analog of gonadotropin-releasing hormone (GnRH), potentially mimicking the structure and function of the natural hormone. It may bind to GnRH receptors, initially stimulating the hypothalamic-pituitary-gonadal (HPG) axis, leading to a temporary surge in luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels. In turn, LH and FSH are thought to stimulate endocrine cells, like testicular cells that produce testosterone (T). However, with prolonged exposure, Triptorelin appears to desensitize the GnRH receptors, resulting in suppressed production of LH and FSH, thereby apparently reducing testosterone and estrogen levels. This potential mechanism has been extensively researched in models of androgen deprivation, exploring its potential in various contexts such as prostate cancer cells and receptor-positive breast cancer cells.