IngredientsBovine protein is a broad collective term for the diverse family of proteins derived from cattle (Bos taurus and related bovine species). Rather than denoting a single molecule, "bovine protein" encompasses several distinct protein fractions of nutritional and pharmacological interest, most prominently: bovine whey proteins (a mixture of β-lactoglobulin, α-lactalbumin, bovine serum albumin, immunoglobulins, and lactoferrin), bovine casein, bovine collagen/gelatin peptides, bovine colostrum proteins (immunoglobulins, lactoferrin, growth factors), and serum-derived bovine immunoglobulin/protein isolate (SBI). Each of these fractions differs in amino acid profile, biological activity, and intended application.
Whey protein is one of the two high-quality proteins derived from cow's milk, casein being the other. There are two major types of whey protein ingredients: whey protein concentrates (up to 80% protein) and whey protein isolates (90% protein). Whey proteins are manufactured as a by-product of the manufacturing of other dairy products such as cheese and casein.
The whey from bovine milk contains several distinct proteins. The main proteins are β-lactoglobulin (β-Lg), α-lactalbumin (α-La), bovine serum albumin, and immunoglobulin, representing approximately 0.27%, 0.12%, 0.025%, and 0.065% in milk, respectively.
Bovine collagen is sourced from the connective tissues of cattle. Bovine collagen proteins are extracted from the skin, muscles, and bones of bovine species like water buffalo, bison, yak, and cows. The most preferred source to obtain bovine collagen protein is cowhides, bones, tendons, and other parts.
Bovine colostrum (BC) is the first milk produced by cows after calving. The early secretion of mammals called bovine colostrum, produced during the first few days after giving birth, is highly valued for its nutritional content and potential therapeutic uses. BC is produced in excess of that required by suckling calves, and this excess is collected, processed, and sold commercially to promote general health and immune support for animal husbandry and for human use, and also shows potential for treatment of several medical conditions.
Serum-derived bovine immunoglobulin/protein isolate (SBI) is derived from bovine blood serum. SBI is a light-colored powder composed of finely ground flakes of immunoglobulin and other serum proteins (i.e., transferrin, albumin, alpha and beta proteins).
The use of bovine-derived protein preparations is among the oldest nutritional and medicinal traditions in human history, predating the modern concept of the protein molecule by millennia.
Bone broth has a long history that dates back to ancient civilizations such as China, Egypt, and Greece. These cultures recognized the value of utilizing every part of an animal and understood the nutritional benefits of bone broth. In ancient China, bone broth was a staple in traditional Chinese medicine, known for its healing properties and ability to promote overall health. It was often used to support digestion, boost the immune system, and strengthen the kidneys and bones.
In cultures across Europe, Asia, and Africa, the slow cooking of bones has for millennia produced inexpensive but nutritious meals. What began as a way for poorer households to extract value from scraps became a long-standing tradition.
The term "jiao" (胶) widely refers to the glue (gelatin) consisting of collagen and other fiber proteins extracted by boiling hide from various animals, such as cows, horses, deer, and donkeys. Its use can be traced back as far as ancient Egypt, where it was used as an adhesive on burial accessories; cowhide glue was also used in colored wall paintings dating back 4,400 years. There are similar examples from ancient Greece and Rome, where people used cowhide glue.
Ancient Greek medicine associated bovine bone preparations with digestive health. In ancient Greece, the father of medicine Hippocrates was also recommending it for cleansing and digestion issues.
In the 19th century, scientific interest in bovine-derived protein preparations intensified. In the early 1800s, the process for extracting pure gelatin from bones was developed, leading to a better understanding of bone broth's components. The German chemist Justus von Liebig studied the nutritional value of bone broth, leading to the creation of beef extract and bouillon cubes.
Cow's milk and its protein fractions have been integral to human diets and medical preparations across virtually all cattle-herding cultures. The curdling of milk to produce cheese — and consequently its whey fraction — has roots in Neolithic agropastoral societies across the Middle East and Europe. Whey, initially a by-product of cheese-making, was consumed in traditional European folk medicine as a remedy for a variety of conditions, including digestive ailments and debility, prior to modern nutritional characterization.
The first milk of mammals after delivery was recognized in many traditional cultures as having particular potency. Bovine colostrum was historically used in rural communities as a food for newborns and weak individuals, and its immune-transferring properties were empirically observed long before the discovery of immunoglobulins.
Whey is very rich in essential amino acids and has an exceptionally high biological value of 104. It is a rich source of sulfur-containing amino acids (methionine and cysteine), is high in glutamine, and contains large amounts of the branched-chain amino acids (BCAAs) leucine, isoleucine, and valine.
Of the 9 essential amino acids, whey proteins are notably rich in lysine, methionine, leucine, and tryptophan, which are generally the most limiting amino acids in other foods.
Whey proteins are an excellent source of essential amino acids (EAA; 45%) that provide enhanced health benefits in comparison to casein or soy proteins. With respect to branched-chain amino acids (BCAAs), whey protein contains a relatively high level of BCAAs (~26% including leucine, isoleucine, and valine) with approximately 11–14% leucine.
β-Lactoglobulin (β-Lg) is the most abundant whey protein. Beta-lactoglobulin can bind a variety of lipids, including retinol, long-chain fatty acids, and vitamin D. It has been proposed that β-Lg lipid binding may facilitate lipid transport in milk and intestinal uptake of retinol and fatty acids in the neonate.
α-Lactalbumin (α-La) is structurally related to human α-La. Bovine α-La is structurally similar to human α-La; thus, the supplementation of bovine α-La can help make bovine milk a closer match to human milk for infants. The α-La hydrolyzed peptides have shown various health benefits, such as antihypertensive activity, antiviral activity, antimicrobial activity, and growth-promoting and opioid activity.
Lactoferrin (LF) is an iron-binding glycoprotein. LF has been used as an iron fortification source for people such as infants for promoting body growth, athletes for compensating for the loss of iron during exercise, and pregnant women for preventing iron-deficiency anemia. The supplementation of LF in infant formulas also showed benefits such as modulation of immune function, antipathogenic effects, and better absorption of other nutrients, such as calcium.
Cysteine and glutathione precursors: Sweet whey proteins contain 7 times more cysteine than casein, while acid whey has 10 times more cysteine. Cysteine is the rate-limiting amino acid for glutathione (GSH) synthesis, a tripeptide made of glutamate, cysteine, and glycine which has primary functions in the defense of the body in case of stress.
The digestion and absorption of whey and casein differ in that casein, unlike whey, coagulates in the stomach due to its precipitation by gastric acid. As a result, overall gastric emptying time for casein is longer and there is a smaller postprandial increase in plasma amino acids compared with the non-coagulating whey proteins. Casein also has intrinsic properties such as opioid peptides, which effectively slow gastric motility. The biological activities of caseins derive from their amino acid content and their mineral-carrying activity, which helps in the passive absorption of minerals.
Collagen Type-I, II, III, and IV are the principal collagen proteins that occur in the body, and the collagen extracted from bovine sources has a rich amount of Type I and Type III collagens. These are the structural collagens predominant in skin, bone, tendon, ligament, and vascular walls.
After ingestion of hydrolyzed collagen, collagen peptides are broken down into amino acids and short bioactive peptides such as proline-hydroxyproline, which have been detected in the bloodstream and studied for their role in collagen metabolism. This peptide availability is central to how collagen supplements are thought to work, rather than collagen being absorbed intact.
Bovine colostrum exhibits a more significant overall protein content compared to mature milk. This disparity primarily arises from elevated levels of immunoglobulins and casein in BC. The total protein concentration in BC comprises approximately 15% of its weight on the first day, gradually decreasing to around 3% in mature milk. The proteins in colostrum include immunoglobulins (antibodies), lactoferrin, lactalbumin, and various growth factors.
BC is a rich source of growth factors, such as EGF and IGF-1, with concentrations falling rapidly during the first 2–3 days post-calving. Several growth-factor constituents of BC elicit pro-proliferative (growth) and protective effects when tested in cell lines and in vitro gastrointestinal models, suggesting relevance for maintaining gut integrity or stimulating repair.
SBI is composed of ≥90% pure protein with significant amounts of essential amino acids. Over half of the protein content is in the form of immunoglobulins, in which IgG constitutes the major isotype or class.
SBI is uniquely formulated and provides a distinct nutrient with a multifaceted mode of action that involves binding and neutralization of microbial components, which helps to maintain a beneficial gut microbiota, manage gut barrier function, and maintain immune balance.
Rapidly digested proteins that contain high proportions of essential amino acids (EAAs) and adequate leucine are most effective in stimulating muscle protein synthesis (MPS). Whey is categorized as a "fast protein" due to its solubility and rapid gastric transit. Researchers gave a 30 g bolus of whey protein and a 43 g bolus of casein protein to subjects on separate occasions and measured amino acid levels for several hours after ingestion. They reported that the whey protein condition displayed robust hyperaminoacidemia 100 min after administration. However, by 300 min, amino acid concentrations had returned to baseline. The area under the curve calculations demonstrated a 200% greater increase in leucine concentrations in the blood following whey versus casein ingestion.
Leucine can participate in the intracellular metabolic pathways regulating synthesis of skeletal muscle protein, thus enhancing the synthesis of skeletal muscle protein.
Whey protein is an important source of sulfur-containing amino acids (cysteine) in the human body, which are important precursors for making up glutathione and taurine. Glutathione plays a key role in free radical scavenging and immune response. Glutathione, as well as taurine, can inhibit lipid peroxidation and play an antioxidant role.
Recent studies show that enzymatically hydrolysed collagen (collagen peptide) is absorbed and distributed to joint tissues and has analgesic and anti-inflammatory properties. The hypothesized mechanism involves dietary collagen peptides acting as partial agonists on collagen-synthesizing fibroblasts and chondrocytes, stimulating endogenous matrix production.
Numerous studies have demonstrated that oral administration of plasma- or serum-derived protein concentrates containing high levels of immunoglobulins can improve weight management, normalize gut barrier function, and reduce the severity of enteropathy in animals. Nonclinical studies have found that as much as 50% of IgG from SBI survives transit through the stomach, while 5%–10% survives during transit through the entire intestinal tract.
Whey protein is one of the two high-quality proteins derived from cow's milk. Its high digestibility, quick absorption, and well-researched benefits for muscle gain and cardiometabolic health make it a popular protein supplement among athletes and older adults.
A 2021 systematic review and meta-analysis published in PMC examined animal versus plant protein in lean mass support across randomized controlled trials (RCTs). Both soy and animal protein (whey, beef, and dairy) produced significant increases in strength (1-RM bench press and 1-RM squat) in response to resistance exercise training, with no difference between protein groups.
In the specific context of older adults and sarcopenia, a systematic review and meta-analysis (published in PMC, 2023) including randomized clinical trials conducted on sarcopenic adults aged 60 or older (seven RCTs, 591 participants) found that the overall pooled standardized mean difference (SMD) estimate showed a small effect size in favor of resistance exercise training plus whey protein for skeletal muscle mass according to appendicular muscle index, with statistically significant differences compared with resistance training with or without the placebo group (SMD = 0.24; 95% CI, 0.05 to 0.42; p = 0.01; I² = 0%).
A 2025 systematic review and pairwise meta-analysis assessed whey protein's effects on body composition, muscular strength, and cardiometabolic health in older adults. Subgroup analyses showed that whey protein plus resistance training increased lean body mass, while WP alone improved lower-body strength, with no other significant effects observed. The conclusions were that WP supplementation moderately increases lower-body muscle strength in older adults.
A 2024 systematic review and meta-analysis found that WP can significantly increase the strength of the lower body when combined with resistance training, but does not appear to have a significant clinical effect on handgrip strength, physical performance, or body composition. Additional studies are needed to confirm the positive impact of WPS on appendicular skeletal muscle mass in older adults.
Evidence strength: Moderate to strong for lower-body muscle strength when combined with resistance training; evidence for body composition changes is more mixed and context-dependent.
Clinical trials investigating collagen peptides have reported improvements in skin elasticity, skin hydration, and dermal collagen density after regular intake, typically over periods of 8 to 12 weeks. These effects are modest but measurable, and they appear most clearly in adults whose natural collagen production has already begun to decline.
Two placebo-controlled clinical trials examining oral collagen peptide supplementation demonstrated increased skin hydration, higher dermal collagen density, and reduced fragmentation after oral collagen peptide supplementation.
Evidence strength: Preliminary to moderate. Most trials are small and of short duration, but the direction of evidence consistently favors improvements in skin hydration and elasticity. Robust large-scale RCTs remain limited.
A double-blind, placebo-controlled, randomised trial with collagen peptides isolated from pork skin and bovine bone (BCP) sources was carried out to study the effectiveness of orally supplemented collagen peptide in patients with knee osteoarthritis. Improvement was assessed with reduction in Western Ontario McMaster Universities (WOMAC), visual analogue scale (VAS), and quality of life (QOL) scores from baseline to 13 weeks. There was significant reduction from baseline in the primary end points of WOMAC and VAS scores and in the secondary end point of QOL score in subjects with both collagen peptide groups, while in the placebo group the endpoint indicators did not improve significantly.
Research on collagen peptides has mainly focused on the impact supplementation may have on bone and joint health, due to its role in regulating tendon and bone turnover. Collagen peptide compounds have been receiving scientific attention as potential oral supplements for the recovery of osteoarticular tissues.
Evidence strength: Preliminary to moderate. Some RCTs show meaningful reductions in osteoarthritis pain and function scores, but trial quality is heterogeneous and the number of adequately powered studies remains small.
A 2024 systematic review searched PubMed, ISI Web of Science, and Scopus, including 22 clinical trials (1,427 patients). Out of 6,881 records, 22 clinical trials (uncontrolled = 4, cross-over = 1, and parallel = 17) with 1,427 patients were enrolled. Diarrhea, the most frequently evaluated symptom (20 interventional arms), was decreased in frequency with BC supplementation in 15 of these arms.
The systematic review showed that BC supplementation has the potential to improve diarrhea frequency, as well as stool evacuation/consistency, but not the duration of diarrhea.
BC use as a food supplement showed interesting effects preventing upper respiratory illness in sportsmen, modulating immune system response, and reducing intestinal permeability in healthy and sick subjects.
Evidence strength: Preliminary to moderate. Evidence is conflicting across trials due to high heterogeneity of populations, doses, and study designs. Consistent signals exist for reduction in diarrhea frequency and gut permeability, particularly in athletes and immunocompromised patients.
Numerous studies have demonstrated that oral administration of plasma- or serum-derived protein concentrates containing high levels of immunoglobulins can improve weight management, normalize gut barrier function, and reduce the severity of enteropathy in animals. Recent trials in humans provide preliminary evidence that a serum-derived bovine immunoglobulin/protein isolate is safe and improves symptoms, nutritional status, and various biomarkers associated with enteropathy in patients with HIV infection or diarrhea-predominant irritable bowel syndrome.
In a prospective open-label study of 15 patients with IBS-D, SBI (5.0 g, twice a day) was evaluated over 8 weeks on safety, bowel function and abdominal pain, tryptophan metabolism, intestinal permeability, bile acid synthesis, duodenal and stool microbiome, and the expression of 90 genes related to inflammation, immune function, and tight junctions in duodenal mucosa.
Recent studies in humans demonstrate that SBI is safe and improves the nutritional status and GI symptoms (e.g., chronic loose and frequent stools, abdominal discomfort, bloating, urgency) in patients with enteropathy.
Serum-derived bovine immunoglobulin/protein isolate (SBI), specially formulated to increase IgG and other proteins, has been extensively studied in animal models and recently has been found to be safe and effective in the management of the enteropathy associated with diarrhea-predominant IBS (IBS-D) and HIV infection.
Evidence strength: Preliminary. Human evidence is limited to small studies; notably, SBI is classified and regulated as a medical food (under brand name EnteraGam®) in the United States for this indication, distinguishing it from typical dietary supplements.
There is evidence that BC supplementation is effective against infections and respiratory allergies, as well as in attenuating immunosuppression caused by intense exercise in high-performance athletes.
Consumption of bovine immunoglobulins from milk or colostrum of immunized cows decreased enterotoxigenic E. coli-induced diarrhea as well as rotavirus infection.
Any generalized immune effect of BC in humans is probably mediated by mechanisms and factors other than exclusively IgG-mediated direct antigen binding.
Evidence strength: Preliminary to moderate. The strongest signals are for infection prevention in athletes and immunocompromised populations. General immune enhancement in healthy adults requires further large-scale RCT evidence.
Osteoporosis rats treated with a collagen hydrolysate showed significant elevation of their bone mineral density levels compared with controls. A food supplement of hydrolyzed collagen improved the compositional and biodynamic characteristics of vertebrae in ovariectomized rats.
Oral administration of collagen peptide compounds improved the effects of calcitonin for postmenopausal osteoporosis patients.
Evidence strength: Mostly preclinical (animal models) with limited human clinical trial data. Bone biomarker data in human studies are promising but not yet definitive.
The following dosages are reported directly from the cited clinical research and should not be interpreted as recommendations.
Because whey protein comes from cow's milk, people with a cow's milk allergy can be allergic to it. People with a cow's milk allergy are typically advised to avoid milk products such as whey protein. Cow's milk allergy is relatively common among children, affecting 2–3% of children younger than 3 years old. However, it is less common in adults. About 80% of people with cow's milk allergy outgrow the condition by the age of 16.
An allergy to whey protein should not be confused with lactose intolerance. Lactose intolerance is different from a milk protein allergy. It is caused by an enzyme deficiency.
Allergic reactions to whey protein are possible, even in people without a known milk allergy.
Underdosing, contamination, and adulteration are possible with whey protein supplements. Using supplements from reliable manufacturers is advised.
Severe adverse reactions can occur in people with urea cycle disorders, which can go undiagnosed.
High doses of whey protein may exacerbate (temporarily worsen) postmeal low blood pressure in older adults. Because there is no evidence and there is a risk of heavy metal contamination, caution is advised during pregnancy and lactation.
While BC products are well tolerated, some patients allergic to dairy products may experience undesirable side effects such as gastrointestinal problems like flatulence and nausea.
Bovine colostrum contains IGF-1, a growth factor that is on the World Anti-Doping Agency (WADA) prohibited list. Being a dietary supplement and without any narcotic, steroidal, or euphorigenic properties, it is suggested that BC should be removed from the WADA anti-doping list. Athletes subject to anti-doping regulations should be aware of this consideration with respect to colostrum-based products.
Bovine bone is the main by-product in the bovine processing industry and has been widely used as raw material to obtain high-quality gelatin. Although there are some concerns with mad cow disease (BSE) in Europe and the United States, bovine bone is still one of the most abundant sources of gelatin and accounts for 23.1% of gelatin production. Reputable manufacturers are required to source material from BSE-controlled herds in accordance with regulatory standards.
The adverse role of whey protein on human health is still to be clarified. Whey protein derived from cheap milk sources could have less whey protein than expected. Third-party testing and certified manufacturing are recognized quality controls in this area.
Intact bovine IgG was detected in the feces of volunteers but not in serum, providing evidence that bovine Ig is not absorbed from the intestinal lumen into the circulation. This is relevant to concerns about systemic immunogenic effects from SBI supplementation, as the immunoglobulin fraction acts locally in the gastrointestinal tract rather than being systemically absorbed.
Health conditions that Bovine protein may help support.
Body systems that Bovine protein may help support.
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