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Peptides in sports have received a lot of attention in recent years within the sports community: some associate them with better recovery, while others warn about doping violations and health risks. The problem is that the word "peptides" can refer to very different substances – from legal dietary supplements, such as collagen peptides, to WADA-prohibited peptide hormones and other substances. Therefore, it is important to evaluate the specific substance, not just the name "peptides."
This confusion is not just theoretical. For example, BPC-157 and ipamorelin are WADA-prohibited substances, while collagen peptides or protein hydrolysates are not inherently prohibited. For an athlete subject to anti-doping control, the use of prohibited substances can lead to disqualification.
Below you will find a clear answer about which peptides are prohibited in sports and which are allowed, what scientific research shows about their effectiveness, and what legal alternatives may be beneficial for muscles and connective tissue. The information is based on the WADA list of prohibited substances and clinical trial data, not sellers' promises.
Peptides are short chains of amino acids, often defined as consisting of about 2–50 amino acids. Some peptides act as signaling molecules in the body and participate in various physiological processes. Because of these properties, some peptides are marketed in the sports world as capable of improving recovery and athletic performance.
In marketing, peptides are attributed a wide range of potential benefits for athletes:
However, promised benefits do not mean proven benefits. According to Dr. P. Minder's comment on LRT.lt, most peptides popular in sports, including BPC-157, TB-500, and growth hormone secretagogues, lack strong clinical evidence in humans. Their effects are mostly based on data from cell, animal, or very small pilot studies, so these results cannot be directly equated to effects in humans.
This gap between advertising and science is crucial. An athlete purchasing an insufficiently studied peptide based on social media promises essentially takes on an uncertain risk, as the safe doses and long-term effects of some such substances in humans are not sufficiently researched. Meanwhile, when choosing recovery supplements, one can clearly evaluate the specific product composition.
Benefits and risks depend on the specific type of peptide, so it is first necessary to distinguish which peptides are being discussed.
In the sports context, the term "peptides" can encompass different groups: investigational peptides, peptide hormones, and legal dietary supplements, such as collagen peptides. It is important to distinguish these groups because their legal and anti-doping status can differ significantly. Therefore, the status is indicated below for each type: investigational, WADA prohibited, or legal supplement.
BPC-157 is marketed in the sports context for the regeneration of tendons, muscles, and the digestive tract, while TB-500, a thymosin beta-4 fragment, is for tissue healing and faster recovery after injuries. Both can be distributed online as injectable "investigational substances."
However, their status is clear: BPC-157 is classified in the WADA prohibited substances list under Category S0 "Non-Approved Substances" and is prohibited at all times – both in and out of competition.
The level of evidence is also weak. Most studies on peptides popular in sports are conducted mainly with cells and animals, and clinical data in humans is very limited. As experts warn on LRT.lt, "a rat is not a human," so animal study results cannot be directly transferred to humans.
CJC-1295 and ipamorelin stimulate the body's own growth hormone secretion. Because of this mechanism, they are marketed for muscle growth and fat loss, often recommended to be used together.
However, ipamorelin is classified in the WADA list under Category S2 – peptide hormones, growth factors, related substances, and mimetics – and is prohibited at all times, both in and out of competition.
A separate group is GLP-1 analogs, such as semaglutide, used for weight control. However, these are prescription drugs used under medical supervision, not sports supplements.
Collagen peptides and hydrolyzed proteins are components of dietary supplements obtained by breaking down proteins into smaller fragments. They are not WADA-prohibited peptide hormones, so their status essentially differs from prohibited peptide preparations.
Scientific research results regarding their effectiveness are inconsistent. In the study by Jerger et al. (2022), 5 g of collagen peptides per day combined with 14 weeks of strength training increased the cross-sectional area of the Achilles tendon (+11.0%, compared to +4.7% in the placebo group). However, in the study by Balshaw et al. (2023), using 15 g per day for 15 weeks, no significant difference between groups was found.
In the study by Shaw and Baar (2017), 15 g of gelatin with vitamin C, consumed about an hour before physical exertion, doubled the blood level of the collagen synthesis marker PINP. However, only this blood marker was evaluated in the study, not the frequency of injuries.
Data on joint pain are more favorable: in the study by Schulze et al. (2024) with 182 participants, 5 g of collagen peptides per day for 12 weeks significantly reduced pain at rest and while walking, although some authors are associated with the collagen industry. For this purpose, collagen for joints is intended, and for faster amino acid absorption – protein hydrolysate.
Many peptide substances used in sports are prohibited: ipamorelin is classified under WADA S2 category "Peptide hormones, growth factors, related substances and mimetics," and BPC-157 falls under the S0 category "Non-approved substances." Both are prohibited at all times – during competitions and out of competitions. Meanwhile, collagen peptides are not prohibited by WADA.
WADA's logic is clear. A substance or method can be included in the prohibited list if it meets at least two of the three criteria: it can enhance sports performance, pose a real or potential health risk, or violate the spirit of sport. Additionally, pharmacological substances not approved for human therapeutic use can be prohibited under the S0 category.
The practical consequence for tested athletes can be disqualification. The list is updated annually, so before using a new product, it is necessary to check the current 2026 WADA prohibited substances list version.
Price can be misleading here. Some injectable peptides are sold online as "investigational substances," but their quality and composition may be unclear, so purchasing them poses additional risks. Legal peptide dietary supplements, on the other hand, can be freely available, but legal status alone does not guarantee that the product is free from doping risk.
It cannot be generally stated that peptides are safer or act milder than anabolic steroids. Peptides include different substances affecting various body processes, while anabolic steroids act on androgen receptors and can alter hormone balance. Therefore, "milder" does not necessarily mean "safer."
The risk profile differs fundamentally. The side effects of anabolic steroids – hormonal disorders, cardiovascular system problems, and liver damage from some steroids – have been documented for decades. Meanwhile, the risk of many unapproved peptides used in sports is not well studied in humans due to very few clinical trials.
And here lies the paradox. Uncertainty itself is a risk: it is difficult to assess and manage side effects that are not sufficiently studied. The statement "peptides are safer" is based on insufficient data, not reliable safety evidence.
For an athlete, this issue is practically irrelevant. Both anabolic steroids and many peptide substances used in sports are on the WADA prohibited substances list and can pose health risks, so peptides cannot be considered a safer alternative just because their risks are less studied.
Legal peptide supplements, such as collagen and protein hydrolysates, are generally considered safe, while some injectable investigational peptides may pose risks due to unclear composition, sterility issues, and immunogenicity, which is an immune reaction to the peptide.
Black market products additionally pose risks due to unverified concentration, impurities, and possible bacterial contamination in injectable solutions. Since quality control of such preparations may be unreliable or unclear, the buyer cannot be sure what they are actually injecting.
But there are legal ways to achieve results: quality sleep, sufficient protein intake, and supplements with clear composition. For muscle growth, studies by Oikawa (2020) and Jacinto (2022) show that whey proteins may be more suitable than collagen peptides, so for mass one can choose whey isolate or EAA amino acids.
Beta-alanine can increase carnosine – a dipeptide – concentration in muscles: according to the ISSN position (2015), 4–6 g per day for at least 2–4 weeks can improve physical performance, with more pronounced effects observed in 1–4 minute duration efforts. The most commonly reported side effect is tingling (paresthesia), which is not considered harmful.
Consult a doctor before using any injectable substances.
Peptides consist of short chains of amino acids, while proteins are longer chains of amino acids folded into complex structures. Hydrolyzed proteins are partially broken down into smaller peptide fragments, so in some cases they can be digested and absorbed faster than non-hydrolyzed proteins.
Additionally, in the body some peptides perform signaling functions, while proteins can perform structural and many other functions.
There is no straightforward answer. Commonly mentioned BPC-157, TB-500, CJC-1295, and ipamorelin are WADA prohibited, and their clinical trial data in humans is limited.
For legal purposes, the choice is clearer: collagen peptides can be beneficial for joints and connective tissue, while whey proteins are more suitable for muscle protein synthesis. You can find a comparison in the best collagen review.
WADA may include a substance or method on the prohibited list if it meets at least two of three criteria: it can enhance athletic performance, pose a real or potential health risk, or violate the spirit of sport. However, not all peptides are banned.
Substances classified under category S2 are prohibited at all times, not just during competitions. An athlete being tested may face disqualification for using a prohibited substance, and the list is updated annually.
Collagen peptides are not an optimal protein source for muscle growth. In the Oikawa (2020) study, whey proteins stimulated muscle protein synthesis more than collagen peptides, and in the Jacinto (2022) study, whey proteins increased muscle thickness more. Collagen peptides contain less leucine and essential amino acids, so whey proteins are generally more suitable for muscle growth.
The Zdzieblik (2015) study with older men suffering from sarcopenia showed that collagen peptides combined with strength training increased lean body mass more than the placebo group, but the results of this study have faced scientific criticism. More beneficial strategies for muscle mass are described in the muscle building guide.
Instead of risky and WADA banned injectable peptides, athletes in 2026 should rather choose legal, scientifically supported alternatives: whey proteins for muscle growth, beta-alanine to increase carnosine levels, and collagen peptides for connective tissue. The Papildupasaulis.lt assortment includes these sports supplements suitable for both strength and endurance training.
If you want to consult in person, visit our store in Vilnius, Visorių St. 2. We will help you choose products that meet your needs and deliver your order directly to your home.
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