PEPTIDES: Do they ACTUALLY work? (Science explained)
A strongman athlete describes the three peptides he says he takes, the legal and safety caveats, and why he thinks blood testing matters more than the peptides.
With Unnamed representative of Blokes (a blood testing company)
Key moments
Tap a moment to play the video from there.
- 0:00Series intro and caveatsHooper introduces the series, says the evidence is thin, and states that nothing he says is an instruction to take any peptide.
- 2:39What peptides areHe describes peptides as short chains of amino acids that signal the body, using insulin as the example, and contrasts them with hormones.
- 4:11Legal status and tested sportsHooper says legality changes quickly by country and names BPC-157 as not allowed in the US but okay in Canada. He adds that peptides are not allowed in tested sports.
- 5:43Interview on blood testingA Blokes representative says personal experience carries weight given the lack of long-term research. Hooper describes recovering from a hamstring tear and winning a show.
- 13:19BPC-157 explainedHooper says BPC-157 originates in the gut and shows consistent positive effects for soft tissue injuries. He says its mechanism is not well understood.
- 14:19TB4 and thymosin beta 4He describes TB4 as secreted from the thymus and linked to immune function and tissue repair. He says it started as a cancer treatment before athletes took it up.
- 15:50Tesamorelin and growth hormoneHooper describes tesamorelin as a growth hormone releasing analog that raises IGF-1. He says it seems linked to less visceral fat and more muscle size.
- 18:23Side effects he listsHe lists reported effects for each peptide and calls the whole area a bit of Russian Roulette without medical guidance.
- 19:54Evidence gap and ethicsHooper says he found no systematic reviews or meta-analyses in healthy young people. He says an ethics board would not approve such studies.
- 23:23His 9 out of 12 rankingHe scores peptides 9 out of 12, says most healthy people do not need them, and urges everyone to get blood work done.
What the video says
This is episode 8 of Mitchell Hooper's "No Stone Unturned" series. Hooper is a strongman athlete, and he reports on three peptides he says he takes on the advice of a blood testing company called Blokes. The captions also render the name as BLS. He says at the start that there is little good evidence and that the lack of listed side effects may only reflect missing research. He also says nothing in the video is an instruction to take anything. The episode opens with a sponsor message for a supplement brand.
Hooper defines peptides as short chains of amino acids that signal the body to act, with insulin as his main example. He separates them from hormones, which he describes as the messengers themselves. On legality, he says the picture varies by country and changes fast. He says BPC-157 is not allowed in the US but is okay in Canada, and that peptides are not permitted in tested sports. A short interview with a Blokes representative argues for regular blood work. The representative says personal experience has to stand in for long-term research. Hooper describes tearing a hamstring and says he was back training in about a week and a half and won his next competition.
He then walks through BPC-157, TB4 (thymosin beta 4) and tesamorelin, giving his understanding of how each works and what he has noticed. He lists side effects he has read about for each one, including nausea, dizziness and blood pressure changes for BPC-157, and muscle and joint pain for tesamorelin. For TB4 he mentions injection site pain and says the lack of other reported effects reads to him as unknown rather than reassuring.
Hooper says he and his team found no systematic reviews or meta-analyses in young healthy people, and that an ethics board would not approve such a study. He scores peptides 9 out of 12, tied with health monitoring. He says people who are uninjured and have normal blood work do not need them, and he recommends getting blood work done either way.
On each compound
BPC-15713:19
Hooper says BPC-157 originates in the human gut and shows consistent positive effects for various soft tissue injuries. He says its mechanism is poorly understood because it did not come from clinical medicine, and he lists nausea, dizziness, hot flashes and blood pressure changes as possible side effects.
See how your DNA reads BPC-157TB-50014:19
Hooper discusses this under the name TB4 or thymosin beta 4. He says it is secreted from the thymus, supports immune function and has a role in tissue repair, and that it largely seems to come with no side effects other than injection site pain.
See how your DNA reads TB-500Tesamorelin15:50
Hooper describes tesamorelin as a growth hormone releasing analog that raises IGF-1. He says it seems mostly linked to reduced visceral fat, stiffer bones and tendons and larger muscles, and he lists muscle and joint pain as relatively common side effects.
See how your DNA reads Tesamorelin“this is a little bit of an informed Russian Roulette so to speak”
“the scientific evidence is really sort of out to lunch”
What this video doesn’t settle
- Hooper's results come from one elite athlete's own experience, with no control group and no way to separate peptides from his training, diet or other factors.
- He says no systematic reviews or meta-analyses exist for healthy young people, so effects on recovery, muscle or fat are not established here.
- Long-term safety is not addressed beyond Hooper's own caution that side effects may not have been found yet.
Questions this video answers
Do peptides actually work according to Mitchell Hooper?
Hooper says his own experience has been very positive, citing better body composition, strength and recovery. He also says the scientific evidence is thin, and that he and his team found no systematic reviews or meta-analyses in young healthy people.
Which peptides does Mitchell Hooper say he takes?
He names BPC-157, TB4 (thymosin beta 4) and tesamorelin. He says they were recommended to him through a blood testing company called Blokes.
Are peptides legal or allowed in sport, according to this video?
Hooper says legality depends on where you live and is changing fast, and that BPC-157 is not allowed in the US but is okay in Canada. He says peptides are not allowed in any tested sport.
What side effects of peptides does Hooper mention?
For BPC-157 he lists nausea, dizziness, hot flashes and blood pressure changes. For tesamorelin he lists muscle, joint and limb pain, and for TB4 he lists injection site pain. He says the lack of other reported effects for TB4 may just mean they are not yet known.
How does Hooper rate peptides in this episode?
He gives peptides 9 out of 12, tied with health monitoring. He says people who are not injured and have normal blood work do not need them, and he recommends blood testing for nearly everyone.
Video by Mitchell Hooper on YouTube, embedded as published. The summary is written by PeptidesDNA from the video; every claim in it is the speaker’s. Not affiliated with or endorsed by the creator. Not medical advice.
