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The question of whether peptides are dialyzable is a complex one, touching upon their fundamental properties, their presence in the body, and their interaction with medical treatments like dialysis. While peptides are generally small molecules, their behavior in the context of dialysis depends on various factors, including their size, charge, and the specific type of dialysis procedure. Research indicates that certain peptides can indeed be removed through dialysis, while others may be retained or even utilized within the dialysis process.

Peptides are short chains of amino acids, the building blocks of proteins. They play crucial roles in numerous physiological processes, acting as hormones, neurotransmitters, and growth factors. For instance, natriuretic peptides are a class of hormones that regulate the body's fluid and electrolyte balance. These include atrial natriuretic peptide (ANP), B-type natriuretic peptide (BNP), and C-type natriuretic peptide (CNP). In patients with kidney disease, particularly those undergoing hemodialysis, the levels of these natriuretic peptides are often elevated. Studies have shown that B-type natriuretic peptide (BNP) is frequently monitored in hemodialysis patients, as persistently high levels can be associated with mortality, left ventricular hypertrophy, and heart failure. The choice of BNP is often attributed to its shorter half-life and less dependence on kidney function and dialysis.

The investigation into peptides in plasma, urine, and dialysate by T. He (2021) explored the peptidomes of spent hemodialysate, urine, and plasma to understand peptide handling in the kidney. This research suggests that the removal of peptides during dialysis is a relevant area of study. Similarly, research on natriuretic peptides in ESRD (End-Stage Renal Disease) by S. Joffy (2005) highlights their involvement in regulating volume homeostasis, with levels typically increasing in cases of volume expansion. The clinical value of natriuretic peptides in chronic kidney disease is further explored by C. Santos-Araújo (2015), detailing their role in the regulatory response to declining renal function.

Beyond natriuretic peptides, other peptides are relevant in the context of dialysis. For example, C-peptide is a marker used to assess pancreatic function, particularly in individuals with diabetes. Studies have investigated the role of C-peptide in dialysis-dependent patients, with research by L. D’Marco (2025) suggesting its involvement in regulating lipolysis and adipokine release within adipose tissue. In patients with type 1 diabetes, certain enzymes involved in peptide C metabolism may have decreased activity.

The composition of dialysis solutions themselves can also involve peptides. For instance, research by L. Lacou (2016) explores how peptides are implicated in the physical characteristics of food matrices, and the development of dialysis solutions may incorporate glycine-based peptides. A study by P. Deleaval discusses the potential benefits of a dialysis bath enriched with amino acids, suggesting that an enrichment with branched-chain amino acids (BCAAs) could improve the functional status and mobility of patients.

Furthermore, the body's own peptide fragments and therapeutic peptides are being explored for their potential in kidney health. For example, a synthetic peptide has shown promise in protecting kidneys from nephritis by disrupting destructive inflammation, potentially enabling better recovery and maintenance of function (March 2019). The study by II Zamorskii (2015) suggests that polypeptide complexes of the kidney and short peptides can restore the expression of signal molecules, indicating a marker of functional state.

In summary, while the exact dialyzability of every peptide is not uniform, many peptides, particularly smaller ones like natriuretic peptides, are known to be removed by dialysis. The body's handling of these molecules is a significant aspect of kidney function and the management of patients on dialysis. Ongoing research continues to uncover the intricate relationships between peptides, kidney health, and the efficacy of dialysis treatments. Understanding these interactions is vital for advancing patient care and developing new therapeutic strategies.