What is the difference between TB-500 and thymosin beta-4?

Thymosin beta-4 is the full-length 43-amino-acid protein found naturally in human cells. TB-500 is a synthetic fragment containing what researchers believe to be the active region (centered around the LKKTETQ actin-binding sequence). Most published research uses the full-length thymosin beta-4, not the TB-500 fragment. The two are not interchangeable, and biological activity from the full protein cannot be assumed to transfer completely to the fragment.

Does the Wolverine Stack (TB-500 + BPC-157) actually work?

There is no published research studying the combination of TB-500 and BPC-157. The pairing is based on the theoretical rationale that BPC-157 promotes angiogenesis while TB-500 promotes cell migration, addressing complementary aspects of tissue repair. Anecdotal reports from users are generally positive, but without controlled data, it is impossible to determine whether the combination is more effective than either compound alone, and the safety of combining two pro-angiogenic compounds has never been evaluated.

How quickly does TB-500 work?

Anecdotal reports suggest noticeable effects within 2-4 weeks for musculoskeletal applications, with continued improvement over 6-12 weeks. In animal studies using full-length thymosin beta-4, measurable tissue repair improvements were observed within 1-2 weeks. There is no controlled human data to establish reliable timelines.

Can TB-500 regrow hair?

Animal studies using full-length thymosin beta-4 have demonstrated activation of hair follicle stem cells and promotion of new hair growth. However, this research used the full protein, not the TB-500 fragment, and no human studies have been conducted for hair loss applications. The evidence is insufficient to recommend TB-500 as a hair loss treatment.

TB-500 is legal to purchase as a research chemical in the United States and most other jurisdictions. It is not a controlled substance but is also not FDA-approved for human use. It is prohibited by WADA for competitive athletes. Regulations vary internationally, so users should verify local laws.

Where do you inject TB-500?

The most common administration route is subcutaneous injection, typically in the abdominal area (fatty tissue around the navel). Unlike BPC-157, which is sometimes injected locally near an injury, TB-500 is more commonly injected systemically due to its proposed mechanism of promoting cell migration throughout the body. However, neither localized nor systemic injection has been validated in human clinical trials.

Can I take TB-500 orally?

TB-500 is almost exclusively administered by injection. As a peptide, it would be subject to significant degradation by digestive enzymes if taken orally, and there is no research supporting oral bioavailability for TB-500. Unlike BPC-157, which has some evidence of acid stability and oral efficacy for gut applications, TB-500 does not have data supporting oral administration.

Vendor Rankings

Independent rankings of peptide vendors based on aggregated lab data, COA transparency, community sentiment, and verified pricing. We publish everything — including the failures.

218+ samples tracked 142 vendors ranked 15 peptides tracked

All BPC-157 Tirzepatide Semaglutide CJC-1295 Ipamorelin GHK-Cu Retatrutide Tesamorelin

AGreat

B+Very Good

BGood

COkay

DPoor

EBad

FFraud

TB-500 Rankings

ANIMAL STUDIES

218 samples across 142 vendors · Updated weekly from independent lab testing

#	Vendor	Avg score	Purity range	Tests	Verified $/mg	Grade	Profile
Grade C — Okay
1	Yiwu Aozuo Trading Co	6.1	—	6	—	C	review →
2	Yabang Peptide	5.7	—	3	—	C	review →
3	ZePeptide	5.5	—	7	—	C	review →
4	HK Peptides	5.4	—	10	—	C	review →
5	Shanghai ERP peptide Biotechnology	5.3	—	6	—	C	review →
6	Xingruida XDR	5.3	—	3	—	C	review →
7	Wuhan Wansheng Biotechnology	5.1	—	10	—	C	review →
8	Cellupep	5.1	—	4	—	C	review →
9	Zenith Jove Peptide ZJ	5.1	—	4	—	C	review →
Grade D — Poor
10	Reta-Peptide	5.0	—	13	—	D	review →
11	Nexaph	5.0	—	6	—	D	review →
12	ZLZ Peptide	4.9	—	6	—	D	review →
13	Shenzhen Loga Tech LG LOGA	4.9	—	3	—	D	review →
14	Tianjin Eleli Technology Development	4.9	—	3	—	D	review →
15	SRY Labs	4.8	—	9	—	D	review →
16	Shanghai Baoju	4.7	—	4	—	D	review →
17	Lipeptides	4.7	—	4	—	D	review →
18	Uther	4.7	—	4	—	D	review →
19	Allen Biotechnology Co ABC	4.7	—	4	—	D	review →
20	Lumira	4.7	—	4	—	D	review →
21	Dankang BioHealth	4.5	—	6	—	D	review →
22	Welon Peptide Solutions	4.5	—	7	—	D	review →
23	Zhuoyue Biotechnology	4.5	—	3	—	D	review →
24	Shanxi Qianyecao Biotech QYC	4.4	—	4	—	D	review →
25	Tech-Wave Peptides	4.4	—	3	—	D	review →
26	Huaian Hanyou Peptide	4.3	—	4	—	D	review →
27	NuLife Peptides	4.3	—	2	—	D	review →
28	Tianjin Ruiwang New Material Technology Co	4.2	—	8	—	D	review →
29	Xian Yihang Technology	4.0	—	4	—	D	review →
30	Qing Li Peptide	3.8	—	19	—	D	review →
31	LiliPeptide	3.7	—	14	—	D	review →
32	Shanghai Wibson Biotechnology WBS	3.7	—	3	—	D	review →
33	Shanghai Sigma Audley SSA	3.7	—	3	—	D	review →
34	PurePEPS	3.7	—	3	—	D	review →
Grade E — Bad
35	Peptide Crafters	3.2	—	3	—	E	review →
36	Bionexis Peptides	3.2	—	2	—	E	review →
37	Oupeptide	3.2	—	5	—	E	review →
38	Pura Peptides	3.1	—	2	—	E	review →
39	Skye Peptides	2.9	—	3	—	E	review →
40	TSC Top Supplements China	2.9	—	5	—	E	review →
Grade F — Fraud
41	Guangzhou Lengiuanhuang Cosmetics	—	—	3	—	F	review →
42	Cocer Peptides	—	—	3	—	F	review →
43	Amino Usa	—	—	3	—	F	review →
44	Bulk Peptide Supply	—	—	2	—	F	review →
45	Orbitrex Peptides	—	—	1	—	F	review →
46	Hydro Research	—	—	1	—	F	review →
47	Apollo Peptide Sciences	—	—	1	—	F	review →
48	Mokemei Zhengzhou Biotechnology MKM	—	—	0	—	F	review →
49	Wanxi Peptides	—	—	0	—	F	review →
50	VIVA Biotechnology	—	—	0	—	F	review →

Verified $/mg = list price ÷ (avg tested qty / labeled qty). Vendors below the cutoff omitted from view.