Four Leaf Rover Colostrum: Ingredients, Sourcing and Label Facts

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Four Leaf Rover Bovine Colostrum has one ingredient: New Zealand bovine colostrum, 1.97 g per teaspoon, with no inactive ingredients. The current jar holds 29.5 g (1.04 oz), about 15 teaspoons, and carries the NASC Quality Seal. Grass-fed sourcing is on the label; the calf-first and contaminant-testing claims come only from retailers. No IgG percentage is stated.

This page sorts the facts by who states them. Our opinion of the product is in the full review.

What does the Four Leaf Rover label say?

We read the current label images in October 2026. The product page notes a label refresh is in progress, so check your own jar.

Which sourcing claims can you check?

Most of this product's appeal is its sourcing story, so it helps to know where each claim lives and whether anyone outside the company can check it.

One caution about retailer copy: at least one retailer page describes small farms in Canada, with calves left on the cows for 6 to 8 months. That conflicts with the New Zealand origin on the label. Trust the jar over third-party descriptions.

Grass-fed describes how the cows live. It is a fair reason to choose a brand on welfare grounds, and New Zealand dairy is largely pasture-based, but it says nothing about how much active material is in your dog's dose. Letting calves feed first is also the welfare-friendly choice, with a trade-off: antibody levels peak at the first milking after calving and fall over the next few, so colostrum collected later may hold less IgG. Without a stated IgG figure you cannot tell either way. If potency matters to you, ask the brand for a certificate of analysis for your lot, with IgG content and contaminant results.

What is in the colostrum itself?

With a single ingredient, the "actives" are the natural parts of cow colostrum. The product images name IgA antibodies, and brand copy mentions immunoglobulins and proline-rich polypeptides (PRPs). The rest comes from general colostrum composition, not from this label:

• Immunoglobulins (IgG, IgA). A 2025 review of bovine colostrum and canine immune health (opens in a new tab) notes that IgG1 makes up most of the immunoglobulin in cow colostrum. Bovine antibodies are not specific to canine diseases.
• PRPs and lactoferrin. Small peptides and an iron-binding protein, studied mainly in the lab and in people, not in allergic dogs.
• Milk protein and lactose. It is dairy, with less lactose than regular milk, and entirely cow-derived. That matters for dogs with beef or dairy allergies and for lactose-sensitive dogs.

What a stated IgG level does and does not tell you is covered in whole colostrum vs immunoglobulin supplements; the dog studies are on colostrum for dogs.

How long does a jar of Four Leaf Rover last?

The label gives 1.97 g per teaspoon and a 29.5 g jar, so a jar holds about 15 level teaspoons. The "60 Day Supply Large Dog" panel holds at the label amount for 31 to 60 lb dogs; a dog over 60 lb gets about a month or less, and a small dog about four months. These are our estimates, and heaped spoons shorten them. The weight chart, days per jar for every band and a jar calculator are on how to use it.

What does the label leave out, compared with other powders?

Three things are not stated anywhere we checked: an IgG or immunoglobulin percentage, a lactose figure, and the results behind the testing claims. The first is the one that sets it apart from standardized powders. This table compares what each label or brand states, not how well each works; no one has tested them head to head in dogs.

Teaspoon and scoop doses do not convert between brands; follow each label. All six powders we compared are in best colostrum for dogs.

Before you buy: three things to check on the product page

Confirm that the Product Facts panel still shows colostrum as the only ingredient, that the net contents match the 29.5 g jar above, and that the directions image matches the chart on this page. If anything has changed, trust the current label. Get vet approval first for dogs with kidney disease, dogs on medication, and pregnant dogs or dogs intended for breeding.

FAQ

Is Four Leaf Rover colostrum beef flavored?

No flavoring is listed. The label shows New Zealand bovine colostrum as the only active ingredient and no inactive ingredients. The product page lists the flavor as "Beef", which reflects the cow source, not an added flavor. It is still entirely cow-derived, which matters for a dog with a beef or dairy allergy.

Do the calves really get their colostrum first?

The product page says the colostrum is shared with the calves. The more specific claim that calves get the first 12 hours appears only in some retailer product descriptions, not on the label or the brand's product page, and we found no published audit of it.

Does grass-fed colostrum work better for allergies?

There is no evidence either way. No study has compared grass-fed and conventional colostrum in dogs, and no dog study has measured colostrum against itching at all.

Does the label say how long the powder keeps?

The label images show a storage panel, partly cropped in the photos, that reads as store in a cool, dry place. We did not find a shelf life stated. Go by the date printed on your jar.