Thymosin beta 4 (Tβ4) is a highly conserved, naturally occurring, water-soluble regenerative peptide that is found in all tissues and in all cell types, except red blood cells (Goldstein, Hannappel, Sosne, & Kleinman, 2012; Goldstein & Kleinman, 2015). It is also found in the blood and in other body fluids, including tears, saliva, cerebrospinal fluid, and wound fluids (Badamchian et al., 2007; Huang, Wang, Barnes, & Elmets, 2006; Mohring, Kellmann, Jurgens, & Schrader, 2005). Both platelets and leukocytes release Tβ4 into the wound fluid such that the final concentration is 13 μg/mL (Fromm, Gunne, Bergman, et al., 1996; Hannappel & van Kampen, 1987).
Bonding. In the Prairie Vole, oxytocin released into the brain of the female during sexual activity is important for forming a monogamous pair bond with her sexual partner. Vasopressin appears to have a similar effect in males. In people, plasma concentrations of oxytocin have been reported to be higher amongst people who claim to be falling in love. Oxytocin has a role in social behaviors in many species, and so it seems likely that it has similar roles in humans.6
As reactive oxygen species (ROS) have been implicated in the pathogenesis of periodontitis [24], we examined whether H2O2 could down-regulate or up-regulate Tβ4 expression in PDLCs. As shown in Fig 1A and 1B, Tβ4 mRNA and protein expressions were down-regulated by H2O2 in a time- and concentration-dependent manner. Because maximal Tβ4 mRNA and protein expressions were achieved with 200 μM H2O2 within 48 hours in PDLCs, this concentration was used in subsequent experiments.
Treatment of patients with hyperbaric oxygen has been shown to improve the healing of chronic lower extremity wounds of diabetic patients (Londahl et al., 2010). In a pilot study, this treatment has been shown to more than double the number of circulating vascular stem/progenitor cells in these patients by a mechanism that elevates platelet NOS activity and to stimulate recruitment of vascular progenitor cells to wounds made in their abdominal skin (Thom et al., 2011). This treatment might be combined with topical agents for even greater efficacy in healing chronic wounds.

"By understanding the oxytocin system's dual role in triggering or reducing anxiety, depending on the social context, we can optimize oxytocin treatments that improve well-being instead of triggering negative reactions," said Jelena Radulovic, the senior author of the study and the Dunbar Professsor of Bipolar Disease at Northwestern University Feinberg School of Medicine. The paper was published July 21 in Nature Neuroscience.
The tb-500 has a systematic effect regardless of where it is injected. Some believe that thymosin beta-4 should be injected as close to the injury as possible however there is no evidence to show this would be superior. It can be injected subcutaneously (stomach fat) or intramuscularly (shoulders, thighs, buttocks). Injections should be given in different sites (rotated) each time. Depending on the spot, you can either feel nothing or you can feel slight pain - you will learn your favorite spots in time.
Addiction vulnerability: Concentrations of endogenous oxytocin can impact the effects of various drugs and one's susceptibility to substance use disorders. Additionally, bilateral interactions with numerous systems, including the dopamine system, Hypothalamic–pituitary–adrenal axis and immune system, can impact development of dependence. The status of the endogenous oxytocin system might enhance or reduce susceptibility to addiction through its interaction with these systems. Individual differences in the endogenous oxytocin system based on genetic predisposition, gender and environmental influences, may therefore affect addiction vulnerability.[72] Oxytocin may be related to the place conditioning behaviors observed in habitual drug abusers.
I was kind of scared because I ran across some threads that said TB500 leads to cancer or promotion of benign tumors…most of these were at least 4-5 years old though and it seems there are countless logs online all with good experiences. Nonetheless I was still worried so I did some more research and came across a pharmaceutical company in the US doing clinical trials for thymosin beta 4 to help with dry eye syndrome. I have attached some links. This makes me feel much safer but if you have any more insight I’d really appreciate it.

Autism. A 1998 study found significantly lower levels of oxytocin in blood plasma of autistic children.7 A 2003 study found a decrease in autism spectrum repetitive behaviors when oxytocin was administered intravenously.8 A 2007 study reported that oxytocin helped autistic adults retain the ability to evaluate the emotional significance of speech intonation.9
Our nutrition team created these easy mix-and-match menus using the same guidelines that helped 5-HTP dieters lose weight at top speed during the University of Rome study. The idea here is simple: You’ll eat balanced meals that keep you feeling energized and awesome, but you’ll also watch portions so you’re not overeating out of habit. While using these menus, be sure to drink plenty of water and add any other zero-cal beverages you like. You’re also encouraged to season meals to your liking with unlimited herbs, spices, vinegar, mustard, and citrus juice. As always, get a doctor’s OK before trying any new plan.
These studies demonstrate that in the animal model of TBI, early (6 hours post injury) treatment with Tβ4 i.p. at doses of 6 and 30 mg/kg reduces cortical lesion volume and hippocampal cell loss and improves functional recovery, suggesting its potential as a neuroprotective therapy for TBI. More importantly, delayed (24 hours post injury) treatment with Tβ4 administered i.p. at a dose of 6 mg/kg does not reduce lesion volume but significantly improves functional outcome in rats.34 Tβ4-induced angiogenesis, neurogenesis and oligodendrogenesis may contribute to functional recovery.34 Therefore, our data suggest that promoting endogenous neurorestorative processes using Tβ4 provides a novel therapeutic option for TBI. It should be noted that systemic administration of Tβ4 is safe and well-tolerated by animals and humans.26 Further investigation of the molecular mechanisms underlying Tβ4-mediated neuroprotection and neurorestoration is warranted.
Interestingly, there are numerous differences in the biology of teleosts and mammals, as well as specific differences in cardiomyocyte cellular structure and anatomy, all of which might contribute to regenerative variability. Unlike mammals, zebrafish can grow throughout most of adulthood, a phenomenon called “indeterminate growth” (Jordan, 1905). In fact, their growth can be affected markedly by changes in nutrition and population density (Goldsmith et al., 2006). It is thus possible that the capacity to replace cardiac tissue rapidly in teleosts has been retained in evolution as a function of the need for robust animal and cardiac growth. Indeed, a recent study has found that experimentally-induced adult cardiac growth in zebrafish is hyperplastic, and appears to rely on the same signals present or required during cardiac regeneration (Wills et al., 2008).

When combined with antidepressants of the MAOI or SSRI class, very high parenteral doses of 5-HTP can cause acute serotonin syndrome in rats.[23][24] It is unclear if such findings have clinical relevance, as most drugs will cause serious adverse events or death in rodents at very high doses. In humans 5-HTP has never been clinically associated with serotonin syndrome, although 5-HTP can precipitate mania when added to an MAOI.[25]