Why We Don't Add Iron to Our Kids Protein (And Why That's a Good Thing)

When parents first look at the ingredients list for Kids Immune Protein, one of the first questions I get is: "Why isn't there iron in it?"

It's a fair question. Iron is one of the most commonly discussed nutrients in children's health. Paediatricians test for it. Parents worry about it. And almost every kids multivitamin on the market includes it. So leaving it out looks like an oversight.

It's not. It's one of the most deliberate decisions I made when formulating this product, and I'd argue it's one of the things that makes it work better than most supplements on the shelf.

Here's the science behind why.

Zinc and iron compete for absorption

This is the part most supplement companies don't talk about, because it's inconvenient for their formulations.

Zinc and iron are both essential minerals. Children need both. But when they're consumed together in supplemental form, they compete for the same absorption pathways in the gut. Research has consistently shown that taking iron and zinc at the same time can reduce the absorption of both, meaning your child gets less of each than what's listed on the label.

This is a well-documented interaction. It's not controversial in nutrition science, it's just not widely discussed in consumer-facing marketing, because most brands find it easier to list both on the label and let parents assume their child is absorbing all of it.

I didn't want to do that. I wanted every milligram of zinc in our formula to actually reach your child's body.

Why zinc is so important for kids

Zinc is one of the nutrients I'm most passionate about for children, particularly fussy eaters. Here's why:

Immune function. Zinc plays a critical role in the development and function of immune cells. Children who are zinc-deficient get sick more frequently and take longer to recover. For daycare-age children who are constantly exposed to bugs, adequate zinc is essential.

Appetite regulation. This is the one that surprises most parents. Zinc deficiency is directly linked to reduced appetite in children. A 2021 study found that 37.4% of picky eaters had lower zinc levels than non-picky eaters. So if your child isn't eating well, their zinc drops, which makes them eat even less. It's a cycle, and ensuring adequate zinc absorption is one way to help break it.

Growth and development. Zinc is essential for cell division, tissue growth, and wound healing. During the rapid growth phases of early childhood, demand for zinc is high.

Our formula provides 40% of the recommended daily intake of zinc in a form (zinc gluconate) that's well-absorbed and gentle on the stomach. By keeping iron out of the formula, we ensure that full 40% has the best possible chance of being absorbed and used by your child's body.

But doesn't my child need iron?

Possibly, yes. And if they do, I absolutely want them to get it, just not in the same scoop as their zinc.

Iron needs vary significantly between children. Some kids get plenty of iron from their diet (red meat, legumes, fortified cereals). Others, particularly fussy eaters, vegetarian children, or kids going through rapid growth phases, may be low and benefit from supplementation.

If you're concerned about your child's iron levels, the best first step is a simple blood test through your GP. This gives you an actual number rather than guessing. If supplementation is needed, it can be given at a different time of day to the zinc-containing supplement, which avoids the absorption competition entirely.

This is actually why we created our Mother & Infant Whole Iron + C as a separate product. It's a whole-food iron supplement paired with vitamin C for enhanced absorption, designed to be taken at a different time of day. This way, families who need both iron and zinc can give their child the full benefit of each.

Separating them isn't less convenient, it's more effective. And when it comes to my own kids, I'll always choose what works over what's easy to market.

What other brands do (and why)

Most kids multivitamins and supplement powders include both iron and zinc in the same formula. This isn't because it's the best approach nutritionally, it's because it's simpler for the brand to manufacture one product and list as many nutrients as possible on the label. More ingredients looks more impressive. More tick boxes.

The problem is that a long ingredients list doesn't mean better absorption. In fact, some of those ingredients may be actively interfering with each other. Iron and zinc are the most well-known example, but there are others: calcium can also inhibit iron absorption when taken together.

The approach I recommend

Based on my experience both clinically and as a mum, here's what I suggest for most families:

The bottom line

Leaving iron out of Kids Immune Protein wasn't a cost-cutting decision or an oversight. It was a science-backed choice to ensure the zinc in our formula is fully absorbed, because zinc is one of the most critical nutrients for fussy eaters, immune function, and growth in young children.

We'd rather give your child fewer ingredients that actually work than a long list that looks impressive on the label but underdelivers in the body.

That's the Unrefined approach: every ingredient earns its place.

Have questions? I'm always happy to chat. Reach out on Instagram @the__unrefined or email hello@unrefinednutrients.com.au.

Nicola x

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