Sport research · Rugby

Peptides for rugby: collisions, recovery and the brain-health evidence

South Africa’s national sport is also one of the most studied collision sports on earth. This page maps rugby’s physical demands onto the evidence radar and is candid about what the research says — including the neurodegeneration data.

Head-impact sportWADA 2026 status checkedVerified PubMed citations

Tested athletes: read this first

Under the WADA 2026 Prohibited List (in force from 1 January 2026), BPC-157 is named under S0, TB-500 under S2.3, Ipamorelin and Tesamorelin under S2.2.4 and MOTS-c under S4.4.1 — all prohibited in and out of competition. Research peptides with no regulatory approval anywhere are caught by S0’s catch-all wording. Tested athletes: these are banned. South African athletes can check with SAIDS and the official 2026 List.

The demands

What rugby asks of the body

A professional rugby union match involves well over a hundred tackles and dozens of rucks, scrums and mauls, with forwards absorbing the heaviest collision load and backs the highest sprint speeds. Across a URC, Currie Cup or Varsity Cup season that becomes weeks of cumulative bruising, shoulder and knee injuries, hamstring strains and — the issue that now dominates the sport’s medical conversation — concussion and repeated sub-concussive impact.

The strongest long-term signal comes from Scotland. Russell and colleagues matched 412 former Scottish international rugby union players against 1,236 people from the general population and followed them for a median of 32 years: 11.4% of former players were diagnosed with a neurodegenerative disease versus 5.4% of the comparison group (hazard ratio 2.67). That is observational data, but it is the reason World Rugby has overhauled its head-injury protocols and why a rugby page that ignores the brain would be incomplete.

South African rugby runs from schoolboy rugby — Craven Week is a national institution — through club and provincial unions to the Springboks. Players in SARU-sanctioned competitions and school first XVs can be tested by SAIDS, and school-level positive tests are not rare. The anti-doping table below applies to every one of them.

Mapped to the evidence radar

Each demand below is mapped to one of the ten fixed research areas on our evidence radar. The heavier the weight, the more that area counts when compounds are ranked for Rugby: Recovery & Repair ×3, Cognition & Focus ×3, Sleep & Recovery Rhythm ×2, Muscle & Body Composition ×1, Gut & Immune ×1.

Collision and contact injuries · Recovery & Repair
Shoulder (AC joint, dislocation), knee ligaments and ankle injuries from tackles and rucks. Repair research here is mostly animal work on BPC-157 and Thymosin β4.
Concussion and repeated head impact · Cognition & Focus
The Scottish international cohort found roughly double the neurodegenerative-disease diagnoses among former players. Neuropeptide research (Cerebrolysin, Semax) is in stroke and hospital TBI, not rugby players.
Post-match recovery and travel · Sleep & Recovery Rhythm
Evening kick-offs, adrenaline and long-haul travel across Super Rugby and URC time zones disrupt sleep. Pineal-bioregulator sleep research is in older adults.
Mass and power · Muscle & Body Composition
Forwards need mass and power; GH-axis peptides that touch this axis are prohibited under S2.2.4.

By the evidence

Highest-scoring compounds for Rugby

Ranked by weighted evidence score across Rugby’s research areas. A reading aid for the literature — not a recommendation, and not a performance claim.

Top three for Rugby, overlaid · strength of published evidence per area

Show the scores as a table

Evidence score per research area, 0 to 10
Area	KLOW	Cerebrolysin	Semax
Fat Loss & Metabolism	2	1	2
Appetite Control	1	1	1
Muscle & Body Composition	6	2	3
Recovery & Repair	10	8	7
Skin, Hair & Glow	10	3	3
Gut & Immune	10	4	4
Cognition & Focus	6	10	10
Mood & Calm	5	6	7
Sleep & Recovery Rhythm	3	5	5
Longevity & Energy	9	6	6

KLOW

In stock

7.0Rugby match

Recovery & RepairPrimary10/10

Extensive animal and tissue studies demonstrate rapid healing of tendon, ligament, muscle, and bone.

Cognition & Focus6/10

Copper chaperoning supports neurovascular integrity and dampens neuroinflammatory cascades.

Sleep & Recovery Rhythm3/10

Indirect — studied via anti-inflammatory and nervous-system gene-expression pathways; limited direct sleep data.

S0 + S2.3KLOW contains BPC-157 (named in S0) and TB-500 (named in S2.3). Tested athletes: this is banned.

Research overview View compound

Cerebrolysin

Restocking

7.0Rugby match

Recovery & RepairPrimary8/10

Robust stroke and traumatic brain injury rehabilitation trials prove functional neuroplastic recovery.

Cognition & Focus10/10

Extensive randomized trials in vascular dementia and Alzheimer’s document clear cognitive protection.

Sleep & Recovery Rhythm5/10

Small studies report EEG normalisation in dementia; sleep-specific data are limited.

M2.2Not named, and approved as a medicine in a number of countries. Its trials use intravenous infusions; outside hospital care, IV infusions over 100 mL per 12 hours are a prohibited method (M2.2).

Research overview Notify me on restock Glossary

Semax

Restocking

6.8Rugby match

Recovery & RepairPrimary7/10

Demonstrates robust neuro-rehabilitation and cerebral ischemic protection in clinical cohorts.

Cognition & Focus10/10

Registered medicine with extensive clinical trials proving rapid BDNF induction, memory, and stroke recovery.

Sleep & Recovery Rhythm5/10

Enhances daytime cognitive efficiency, promoting stabilized circadian sleep-wake balance.

S0 (contested)Not named. Semax is a registered medicine in Russia, so S0’s approval test is contested, and it is an ACTH(4-10) analogue (S2.2.2 covers corticotrophins). No published ruling — tested athletes should treat it as a risk and ask first.

Research overview Notify me on restock Glossary

Tesamorelin

Restocking

6.4Rugby match

Recovery & RepairPrimary6/10

Raises IGF-1, the axis studied for collagen synthesis and connective-tissue repair.

Cognition & Focus7/10

Randomized controlled trials confirm significant executive cognitive function gains in older adults.

Sleep & Recovery Rhythm7/10

GHRH signaling deepens Stage 4 slow-wave restorative sleep architecture.

S2.2.4Tesamorelin is named as a GHRH analogue (S2.2.4), non-Specified, prohibited at all times — even though it is an approved medicine elsewhere. Tested athletes: this is banned.

Research overview Notify me on restock Glossary

BPC-157

In stock

6.2Rugby match

Recovery & RepairPrimary9/10

Extensive animal and tissue studies demonstrate rapid healing of tendon, ligament, muscle, and bone.

Cognition & Focus5/10

Modulates the gut-brain axis and exhibits dopaminergic and serotonergic neuroprotective effects.

Sleep & Recovery Rhythm3/10

Indirect — studied via gut-brain and dopaminergic/serotonergic modulation in rodents; limited direct sleep data.

S0BPC-157 is named by the 2026 List as an example of a non-approved substance (S0), prohibited in and out of competition. Tested athletes: this is banned.

Research overview View compound Glossary

Selank

Restocking

6.1Rugby match

Recovery & RepairPrimary5/10

Buffers systemic allostatic stress load, accelerating psychological and physiological recovery.

Cognition & Focus8/10

Prevents stress-induced cognitive decline and boosts working memory and mental resilience under pressure.

Sleep & Recovery Rhythm7/10

Resolves anxiety-driven insomnia, restoring natural nocturnal melatonin and sleep continuity.

S0 (contested)Not named. Selank is registered in Russia, which arguably takes it outside S0’s "no approval anywhere" wording — but anti-doping bodies do not publish a ruling on it. Tested athletes should treat it as a risk and ask their national anti-doping organisation first.

Research overview Notify me on restock Glossary

Scores (0–10) rate the strength of the published research link in each area — large human trials score highest, then smaller human studies (Russian clinical research counted at full weight), then animal and lab work. They describe the literature, not an outcome for any person or athlete. All compounds are supplied strictly for laboratory research purposes and are not for human consumption.

The literature

What published research says about rugby

Former Scottish international rugby union players: 11.4% diagnosed with incident neurodegenerative disease vs 5.4% of matched controls over a median 32 years (HR 2.67).[1]
Amsterdam 2022 consensus on concussion in sport — first author from Wits Sport and Health, Johannesburg.[2]
Chronic traumatic encephalopathy described as a progressive tauopathy following repetitive mild TBI, staged I–IV from post-mortem brains.[3]

Brain health

Head impact, concussion and the neuro research

Rugby involves repeated head impact, so brain-health research is part of the honest picture. Two evidence reviews on this site cover it without the marketing: neuropeptides and brain injury (concussion, traumatic brain injury and CTE — including the trials that found no benefit) and Cerebrolysin and stroke.

The short version: no peptide has been shown to prevent or treat sport-related brain injury, and there is no proven treatment for chronic traumatic encephalopathy. Anyone with concussion symptoms should be removed from play and assessed by a doctor, and return to sport should follow a graded protocol.

Anti-doping

WADA 2026 status of every compound on this page

Quoted from the WADA Prohibited List 2026 (in force 1 January 2026). Where a compound is not named, we say so and explain how the List’s wording applies.

WADA 2026 Prohibited List status per compound
Compound	Status	What the 2026 List says
KLOW	Prohibited — named · S0 + S2.3	KLOW contains BPC-157 (named in S0) and TB-500 (named in S2.3). Tested athletes: this is banned.
Cerebrolysin	Method limit (IV) · M2.2	Not named, and approved as a medicine in a number of countries. Its trials use intravenous infusions; outside hospital care, IV infusions over 100 mL per 12 hours are a prohibited method (M2.2).
Semax	Treat as prohibited · S0 (contested)	Not named. Semax is a registered medicine in Russia, so S0’s approval test is contested, and it is an ACTH(4-10) analogue (S2.2.2 covers corticotrophins). No published ruling — tested athletes should treat it as a risk and ask first.
Tesamorelin	Prohibited — named · S2.2.4	Tesamorelin is named as a GHRH analogue (S2.2.4), non-Specified, prohibited at all times — even though it is an approved medicine elsewhere. Tested athletes: this is banned.
BPC-157	Prohibited — named · S0	BPC-157 is named by the 2026 List as an example of a non-approved substance (S0), prohibited in and out of competition. Tested athletes: this is banned.
Selank	Treat as prohibited · S0 (contested)	Not named. Selank is registered in Russia, which arguably takes it outside S0’s "no approval anywhere" wording — but anti-doping bodies do not publish a ruling on it. Tested athletes should treat it as a risk and ask their national anti-doping organisation first.

FAQ

Rugby: common questions

Are schoolboy rugby players drug-tested in South Africa?

Yes. SAIDS tests at school level, including at Craven Week, and the full WADA Prohibited List applies. BPC-157, TB-500, Ipamorelin and MOTS-c are all named on the 2026 List.

Can any peptide prevent concussion damage in rugby?

No. No peptide has been shown to prevent or treat concussion damage or CTE in athletes. The evidence for reducing harm is in the laws of the game, tackle height, head-injury assessment and graded return to play.

Is there a separate rugby recovery page?

Yes — our rugby-recovery hub covers soft-tissue recovery research in more depth. This page focuses on the whole demand profile, including the brain.

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