Ingredient Science Guide
Bovine Colostrum
Nature's First Food: IgG, IGF-1, Lactoferrin & Growth Factors for Gut, Immunity, and Recovery
Bovine colostrum is the first milk produced by cows in the 24–72 hours after calving, before regular milk begins. It's biologically distinct from regular milk: much higher in immunoglobulins (IgG, IgA, IgM), growth factors (IGF-1, TGF-β), lactoferrin, and bioactive compounds that support a newborn's immune and gut development before its own immune system matures.
More than 30 years of human research has established colostrum across three primary areas: gut barrier function (80% reduction in exercise-induced gut permeability in athletes), immune support (79% increase in salivary IgA), and athletic recovery (multiple RCTs in elite athletes). Wellness Extract sources only first-milking colostrum collected within 6 hours post-calving.
What It Is
What Is Bovine Colostrum?
Colostrum is the first milk produced by mammals in the 24–72 hours after giving birth, before true milk begins. It's nutritionally distinct: thicker, richer, and loaded with immune compounds, growth factors, and bioactive proteins that support a newborn's immunity before its own immune system develops. Bovine colostrum is compositionally similar enough to human colostrum to interact with many of the same biological pathways.
The primary bioactive components include immunoglobulins (IgG, IgA, IgM), insulin-like growth factor 1 (IGF-1), transforming growth factor beta (TGF-β), and lactoferrin, a multifunctional protein with antimicrobial, anti-inflammatory, and iron-binding properties.
Immunoglobulins
IgG, IgA, IgM: Primary Active Immune Compounds
IgG is the dominant antibody class in bovine colostrum (up to 80% of total immunoglobulins). IgA, the secretory antibody found in mucosal surfaces, is critical for gut and respiratory immunity. A 2006 human RCT found a 79% increase in salivary IgA with colostrum over 12 weeks.[4]
Growth Factors
IGF-1 & TGF-β: Tissue Repair, Gut Lining, and Muscle
IGF-1 is a potent signal for protein synthesis and tissue repair. TGF-β modulates intestinal immune responses and supports gut barrier integrity. Both are naturally present in bovine colostrum and partially stable through digestion at supplement doses.
Bovine Colostrum at a Glance
Reference Sheet
Primary SourceFirst milking, grass-fed cows
Collection WindowFirst 6 hours (6-Hour Extracted™)
Key CompoundsIgG, IgA, IgM, IGF-1, TGF-β, lactoferrin
IgG ContentUp to 80% of total immunoglobulins
CertificationCornell Certified (WE formula)
Safety NotesDairy-derived; not for milk allergy
Form (WE)Powder, 150 g (~30 servings)
Lactoferrin & PRPs
Antimicrobial Activity and Immune Calibration
Lactoferrin has antimicrobial activity (binds iron that bacteria need for growth), anti-inflammatory properties, and immune-modulating effects. Proline-rich polypeptides (PRPs) can modulate cytokine production, calibrating rather than simply stimulating immune responses.
How It Works
How Colostrum Supports Gut, Immunity, and Recovery
Colostrum's effects come from combined interaction of multiple bioactive components across three systems: gut lining, immune function, and muscle and tissue recovery.
Gut Lining
Reduces Exercise-Induced Gut Permeability by 80%
What the research found
Human RCT (n=14)A 2011 human RCT (n=14 athletes) found bovine colostrum reduced exercise-induced gut permeability by 80% vs. whey protein control. TGF-β and growth factors in colostrum support maintenance of tight junctions between intestinal cells.[1]
Immune IgA
79% Increase in Salivary IgA: Key Mucosal Antibody
What the research found
Human RCT (n=35)A 2006 RCT (n=35 endurance runners) found a 79% increase in salivary IgA over 12 weeks with colostrum vs. placebo, with a 30% lower incidence of upper respiratory illness in the colostrum group.[4]
Athletic Recovery
Supports Muscle Protein Synthesis and Recovery
What the research found
Multiple Human RCTsIGF-1 in bovine colostrum is a direct signal for muscle protein synthesis. Multiple RCTs in elite athletes have found improvements in performance maintenance or recovery speed with colostrum during intense training blocks.[6]
Illness Prevention
Reduced Upper Respiratory Illness in Athletes
What the research found
Human RCT (n=53)A 2014 RCT (n=53 athletes) found colostrum significantly reduced the number of URTI episodes and total sick days vs. placebo over 12 weeks, complementing the salivary IgA data as multi-layered mucosal immune evidence.[5]
GI Health
Reduced Diarrhea Duration in Children
What the research found
Pediatric RCTA 2020 pediatric RCT (Barakat et al.) found bovine colostrum significantly reduced diarrhea duration and stool frequency vs. placebo. Lactoferrin's antimicrobial activity against gut pathogens is part of the proposed mechanism.[7]
Elite Performance
Maintained Performance in Elite Hockey and Soccer Players
What the research found
Elite Athlete RCTsA 2002 RCT in elite ice hockey players found colostrum maintained performance during high-intensity training. A 2018 study in soccer players found reduced muscle damage markers and improved recovery vs. control after intense training.[6]
Research Findings
4 Areas of Evidence for Bovine Colostrum
Bovine colostrum has 30+ years of human clinical research, particularly in athletes, gut health, and immune function. Not intended to diagnose, treat, cure, or prevent any disease.
Gut Permeability
80% Reduction in Exercise-Induced Gut Permeability
What the research found
Human RCT + ICU Trial + ReviewMarchbank et al. 2011 (n=14 athletes): bovine colostrum reduced exercise-induced gut permeability by 80% vs. whey control. Eslamian et al. 2019 ICU RCT: colostrum significantly improved gut barrier markers vs. standard nutrition. Hałasa et al. 2017 review found consistent evidence across multiple studies.[1]
Immune & IgA
79% IgA Increase + Fewer Sick Days: Two Independent RCTs
What the research found
Two Independent Human RCTsCrooks et al. 2006 (n=35 runners): 79% increase in salivary IgA, 30% fewer upper respiratory illness episodes. Jones et al. 2014 (n=53 athletes): significantly fewer URTI episodes and sick days with colostrum vs. placebo over 12 weeks.[4],[5]
Athletic Recovery
Multiple RCTs in Elite Athletes: Consistent Findings
What the research found
Multiple Human RCTs: AthletesDurkalec-Michalski et al. 2025: improved sprint performance markers. Hofman et al. 2002 (elite hockey): maintained performance during intense training. Kotsis et al. 2018 (soccer): reduced muscle damage markers and improved recovery. Consistent across diverse athletic populations.[6]
GI Health in Children
Reduced Diarrhea Duration in Pediatric RCTs
What the research found
Pediatric Human RCTsBarakat et al. 2020 RCT: significant reduction in diarrhea duration and stool frequency vs. placebo. Huppertz et al. 1999: colostrum reduced total GI illness episodes in young children. These pediatric findings are encouraging; consult a pediatrician before use in children.[7]
Dosage & Forms
How to Use Bovine Colostrum
Available in powder, capsule, and liquid. Powder allows flexible dosing and can be added to smoothies, milk, or water. Wellness Extract's formula is 150 g powder (~30 servings).
Serving Guidance
How Much and When
| Goal | Details |
|---|---|
| Gut health support | 10–20 g/day; mix with water or milk |
| Athletic recovery | 20 g/day during intense training blocks; allow 4–8 weeks |
| Immune support | 10–20 g/day; most RCTs used 10–25 g/day |
Most human research uses 10–25 g/day as powder. Mix with water, milk, or a smoothie. Bovine colostrum is safe for most adults. Consult a doctor if you have a dairy allergy (contains lactose and milk proteins), are immunocompromised, or are pregnant.
Safety Notes
Who Should Avoid Bovine Colostrum
Contains dairy-derived proteins, not suitable for all populations.
| Who | Guidance |
|---|---|
| Milk or dairy allergy | Avoid; colostrum is dairy-derived and contains milk proteins |
| Vegan/vegetarian | Avoid; bovine colostrum is an animal product |
| Lactose intolerant | Consult doctor; colostrum contains some lactose |
Bovine colostrum has an excellent safety record across decades of human research. No serious adverse effects have been consistently reported in healthy adult populations at typical doses.
Why Sourcing Matters
Why 6-Hour Extracted™ and Cornell Certified
Colostrum potency drops significantly after the first 6 hours post-calving. Timing and standards of collection directly determine the immunoglobulin content you receive.
Hours 0–6
6-Hour Extracted™
Only first-milking colostrum collected within the first 6 hours post-calving, when IgG and bioactive compound concentrations are at their peak. After 6 hours, potency drops measurably.
Source Verified
Cornell Certified
Verified through quality analysis standards developed by Cornell University's food science program. Ensures standardized IgG content rather than relying on unverified marketing claims.
Animal Welfare
Grass-Fed, Grade A
Sourced from grass-fed Grade A cows. 'Grade A' means the same hygiene and safety protocols as facilities producing human dairy products.
The Product
Colostrum Powder
150 g powder (~30 servings, 5 g/scoop). Mix 1–4 scoops with water, milk, or a smoothie. No artificial colors, flavors, or sweeteners.
Wellness Extract Products
Colostrum Powder
First Milking · 6-Hour Extracted™
Bovine Colostrum Powder Rich in IgG Protein - Immunity Booster, Gut, Skin, Muscle Support
Premium grass-fed Grade A Cows bovine colostrum powder naturally rich in IgG, lactoferrin, growth factors, proteins, peptides, and amino acids to support gut health & digestive support, immune support, and skin, hair & healthy aging.
6-Hour Extracted™Cornell CertifiedGrass-Fed Grade AThird-Party Tested
- Free shipping
- 30-day money-back guarantee
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- COA available
- Free shipping
- 30-day money-back guarantee
- Subscribe & save 20%
- COA available
Peer-Reviewed Research
Clinical Evidence for Bovine Colostrum
Bovine colostrum has 30+ years of human clinical data, especially for gut health and athletic performance.
01
Marchbank et al.: Colostrum Reduced Exercise-Induced Gut Permeability by 80%
14 endurance athletes: colostrum reduced exercise-induced gut permeability by 80% vs. whey protein control.
[1]
02
Colostrum Improved Gut Barrier Markers in ICU Patients
Significantly improved intestinal permeability markers in critically ill patients vs. standard nutrition.
[2]
03
Colostrum and Intestinal Permeability: Consistent Evidence Across Studies
Systematic review: consistent evidence for colostrum's positive effect on gut permeability.
[3]
04
Colostrum Increased Salivary IgA by 79% in Endurance Runners
12-week RCT: 79% IgA increase; 30% fewer upper respiratory illness episodes vs. placebo.
[4]
05
Colostrum Reduced URTI Episodes and Sick Days in Athletes
Significantly fewer URTI episodes and total sick days with colostrum over 12 weeks.
[5]
06
Colostrum Improved Performance and Recovery in Elite Athletes
Durkalec-Michalski 2025, Hofman 2002 (hockey), Kotsis 2018 (soccer): consistent performance maintenance and reduced muscle damage markers.
[6]
07
Colostrum Reduced Diarrhea Duration in Children
Significant reduction in diarrhea duration and stool frequency vs. placebo in two separate pediatric studies.
[7]Frequently Asked Questions
Answers About Bovine Colostrum
Bovine colostrum is the first milk produced by cows in the first 24–72 hours after calving. It's much higher in immunoglobulins (IgG, IgA, IgM), growth factors (IGF-1, TGF-β), and lactoferrin than regular milk; compounds specifically designed to support a newborn's immune and gut development before its own immune system matures.
Yes; it's one of the most research-supported natural compounds for gut barrier function. A 2011 RCT found colostrum reduced exercise-induced gut permeability by 80%. A 2019 ICU trial found improved intestinal permeability markers. TGF-β and IGF-1 support maintenance of tight junctions between intestinal cells.
Yes. A 12-week RCT in 35 runners found a 79% increase in salivary IgA with 30% fewer respiratory illness episodes. A separate trial of 53 athletes found significantly fewer sick days. Immune support is one of the best-evidenced applications for bovine colostrum.
Bovine colostrum IgG concentrations are highest in the very first milking. After 6 hours, potency drops as regular milk production transitions in. Wellness Extract sources only first-milking colostrum within the first 6 hours post-calving to capture peak immunoglobulin content; many generic products use later-milking colostrum with much lower bioactive concentrations.
Decades of human research with no serious adverse effects in healthy adults at typical doses. The primary contraindications are dairy allergy (contains milk proteins and lactose), vegan dietary preference, and possibly immunocompromised status; consult a doctor.
Source Transparency
References
Click any footnote [n] or this header to expand the full reference list.
[1]
Marchbank et al., 2011: 80% gut permeability reduction, Am J Clinical Nutrition — View on PubMed
[2]
Eslamian et al., 2019: Colostrum in ICU patients, J Parenteral and Enteral Nutrition — View on PubMed
[3]
Hałasa et al., 2017: Colostrum and intestinal permeability, Review — View on PubMed
[4]
Crooks et al., 2006: 79% salivary IgA increase (n=35), Int J Sport Nutrition and Exercise Metabolism — View on PubMed
[5]
Jones et al., 2014: Fewer URTI days in athletes (n=53), British J Nutrition — View on PubMed
[6]
Durkalec-Michalski 2025, Hofman 2002, Kotsis 2018: Athletic performance and recovery RCTs — View on PubMed
[7]
Barakat et al., 2020; Huppertz et al., 1999: Pediatric GI health RCTs — View on PubMed
Disclaimer
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The information on this page is provided for educational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting any new supplement.
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