Colostrum Powder

People buy colostrum for two quite different reasons, at two very different doses, so our naturopaths start by working out which one applies to you.

A good fit if

• Your gut lining is the reason, and you're happy to take a powder at the doses used in trials rather than capsules
• You train hard. Intense exercise is known to make the gut lining more permeable
• You want a low daily dose through cold and flu season, which capsules give you easily
• You're comfortable with dairy, because colostrum is concentrated dairy protein
• You're after endurance rather than strength. Endurance is the only performance measure that improved in trials

Check with us first if

• You're lactose intolerant. Colostrum is a dairy product and lactose levels vary between products, so check the nutrition panel.
• You're buying for a child over 12 months. The evidence in children is weak, and in one trial a fortified colostrum did no better than plain fortified milk powder for growth.
• The product makes a cold or respiratory claim. Those products carry a second age warning (adults only, or not under 2 years without medical advice), and the stricter one applies.
• You're comparing products by IgG percentage. No trial we've seen linked results to IgG content, and there's no known minimum effective level.
• You're looking at goat, sheep or camel colostrum. None of these is a permitted ingredient for listed medicines in Australia, and the one camel trial we found showed no effect.
• You're hoping for a whole-body immune boost. In trials, the only antibody that rose was the one in saliva, and antibodies in the blood didn't change.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before starting.

• Bovine colostrum powder. Best known for: Spray-dried whole colostrum, and the only form Schedule 1 recognises as an active. Absorption: The action in the trials was on gut-lumen and barrier markers rather than on systemic absorption of intact protein. Typical use: The only format that can practically reach the 25 to 45 g a day used in the gut, performance and convalescence trials.
• Colostrum capsules and tablets. Best known for: The same powder, portioned. Commonly 400 mg to 3,000 mg a unit in Australia. Absorption: Never compared with powder in any trial held here. Typical use: Reaches the 0.5 to 1.0 g a day of the triple-blind cold trial easily, and the 3.2 g a day of the antioxidant trial. It cannot reach 25 g a day without an implausible capsule count.
• Chewable colostrum. Best known for: Powder in a chewable base, so it spends longer in the mouth. Absorption: No trial of a chewable form exists here. Typical use: The longer oral contact is mechanism-adjacent reasoning against the saliva and oral-mucosa findings, not evidence. Treat it as a preference.
• Colostrum with added lactoferrin. Best known for: Adds isolated bovine lactoferrin, which is its own separate permitted ingredient with no mandatory warning. Absorption: Lactoferrin was studied at 200 mg a day for inflammation and 35 to 833 mg a day in infant formulas. Typical use: Lactoferrin's own evidence doesn't transfer to colostrum: it cut respiratory infections in infants and children and did nothing in adults.
• Bovine whey immunoglobulin-rich fraction. Best known for: An immunoglobulin-concentrated whey fraction. Not colostrum, despite how it reads on a panel. Absorption: No human trial of it is held here. Typical use: Permitted for oral medicines only, and carries the same under-12-months warning as colostrum.
• Non-bovine colostrum (goat, ovine, camel). Best known for: Marketed as an alternative, with no Schedule 1 entry of any kind. Absorption: Not established. Typical use: The one camel colostrum trial here was null on both its primary endpoints. Don't treat these as interchangeable with bovine.
• Colostrum sold as a food rather than a listed medicine. Best known for: Many Australian colostrum powders carry no AUST L number at all. Absorption: Unchanged. The difference is regulatory, not clinical. Typical use: A food is regulated under the Food Standards Code and may not carry a therapeutic indication. That's why two similar-looking tubs can say very different things.

Reference values. There isn't one. Colostrum isn't a nutrient, so it has no Australian recommended intake and isn't covered by the NHMRC figures.

Typical supplemental range. Doses in the research vary widely, so the right amount depends on why you're taking it. The lowest was 0.5 to 1.0 g a day, taken for 107 days in a placebo-controlled trial on colds. A trial on antioxidant markers used 3.2 g a day for six months, and an immune trial that found no effect used 6.4 g. Every trial that showed a benefit for the gut lining, endurance or recovery used 25 g, 38 g or 45 g a day. Australian capsules usually hold 400 mg to 3,000 mg, so two 400 mg capsules a day gives you 0.8 g. That's within the range of the colds trial, but well short of the others.

Upper level. Australia's permitted ingredients list (Schedule 1) sets no daily maximum for bovine colostrum powder, and we haven't found an established upper limit for people. The only safety reference comes from animals: a 90-day study in rats found no harmful effects at 4,200 mg per kilo of body weight a day, the highest dose tested. That study used a colostrum extract (ultrafiltrate) rather than whole powder, and it isn't a guide to dosing for people.

Worth knowing. The most common way colostrum gets oversold is quoting a result from a 20-gram trial next to a 400 milligram capsule. So match the format to your reason for taking it. Many Australian labels list an IgG percentage, but no trial we've seen compared results by IgG content or set a minimum effective level. A higher percentage is a product specification, not proof it works better. What suits you depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• Bovine colostrum, the first milkings after calving: the only meaningful dietary source of concentrated colostrum bioactives, and it isn't sold as a retail milk
• Human colostrum: the equivalent for a human infant; a preterm meta-analysis found no difference between bovine and human colostrum on any outcome
• Ordinary cow's milk and dairy: the same proteins at far lower concentration; lactoferrin can be extracted from either milk or colostrum

This list is the part of the page we will not shorten. If any of it applies to you, talk to one of our naturopaths or your doctor before starting.

• Cow's milk protein allergy. Colostrum is concentrated casein and whey; allergic reactions to caseins are a named consideration. Absolute avoid.
• Children under 12 months. Mandatory label warning that it isn't suitable except on the advice of a health professional.
• Children under 2 years, where the product carries a cold or upper-respiratory claim. A second mandatory age statement applies.
• Pregnancy and breastfeeding. The monograph position is to avoid use; safety and efficacy information is lacking.
• Lactose intolerance. Colostrum is a dairy product and residual lactose is product-specific.
• Vegans and anyone avoiding animal-derived products. All colostrum is bovine.
• General tolerability. Minor nausea, wind, loose stools, unpleasant taste and skin rash occur infrequently.
• Preterm infants. A 2025 review concluded colostrum cannot be recommended for them on current evidence.
• No serious medicine interaction is documented, which is an absence of documented interactions rather than a guarantee.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before starting.