Cacao & Iron: How to Actually Absorb It
A deep-dive into one of cacao's most impressive nutritional superpowers — and the simple ritual tweak that makes all the difference.
Lately we've been paying a lot more attention to iron — it's one of those fundamental things you don't really think about until you need more of it. With low iron you can experience depleted energy, focus, recovery, and your "oomph" for life starts to feel a bit off.
If you're like us and prefer to minimise the number of pills you take, one of the easiest — and most delicious — ways to increase your iron is through cacao.
Pure ceremonial cacao is naturally rich in iron. Raw cacao powder contains approximately 13.86mg of iron per 100 grams — making it one of the highest plant-based sources of iron known to man, and much higher than beef and lamb at around 2.5mg, and spinach at 3.6mg per 100g. That's a remarkable number for a food you can build a morning ritual around.
While that might sound like the magical hack we've all been searching for, there are two things to consider that most people don't realise:
- Cacao contains non-heme iron
- Cacao contains phenols
Now what does this actually mean?
Two Types of Iron: Heme and Non-Heme
Not all iron is created equal. The iron in animal products — meat, fish, poultry — is called heme iron, and the body absorbs it easily. The iron found in plant foods, like cacao, is called non-heme iron, and it requires a little more support to cross into the bloodstream effectively.
Pre-warning: It gets a bit sciency here!
Vitamin C (ascorbic acid) enhances the absorption of non-heme iron, by changing the iron molecule to make it more readily absorbable. This effect is particularly important for individuals with low dietary iron or increased iron needs.
The good news? The key role of Vitamin C in supporting the absorption of dietary non-heme iron is generally accepted in nutrition science.
So how much Vitamin C do you need? Research suggests that even a small amount makes a meaningful difference. Eating approximately 50mg of Vitamin C — roughly half an orange — alongside your cacao can significantly increase iron uptake.
Simple additions to your cacao ritual: a squeeze of lemon or orange in your cup, a few strawberries on the side, or a small glass of orange juice nearby, or eat half a fresh orange before or after your cacao.
Cacao Contains Phenols (The Blockers)
Here's the part that surprises most people: cacao's own antioxidants — its polyphenols — can work against iron absorption if you're not intentional.
The polyphenols in cocoa, interfere with iron uptake by forming strong complex molecules with iron in the gastrointestinal tract. This chemical binding makes the iron insoluble and unavailable for absorption.
Research has confirmed this effect directly: cocoa was found to be a potent inhibitor of iron absorption, reducing absorption by around 71% compared to a water control.
That sounds alarming — but here's the beautiful thing. Vitamin C prevents inhibitory effects of polyphenols. In other words, Vitamin C has a stronger affinity for iron than the polyphenols do. It effectively binds with the iron first, and makes it available for the body to absorb.
Cacao carries extraordinary amounts of iron and extraordinary amounts of polyphenols, and Vitamin C is the key that unlocks the iron's potential. The relationship between these three compounds is genuinely beautiful from a nutritional science perspective.
What About Dairy Milk?
This one's important, and it's why we always recommend plant-based milks with our cacao.
Proteins present in milk, such as whey and casein, have been found to inhibit iron absorption. Furthermore, the addition of calcium in a drink reduced mean iron absorption by 18–27%.
Beyond the iron absorption question, plant-based milk simply makes a better base for cacao — it keeps the flavour cleaner, honours the nature of the plant, and sits more lightly in the body. Oat milk, almond milk, and macadamia milk all work beautifully.
Key Takeaways (TLDR)
Cacao has a lot of iron — around 13.9mg per 100g, more than any other plant food
It's non-heme iron — which needs a little help to be fully absorbed
Cacao's own polyphenols can block absorption — but Vitamin C counteracts this
Combine Vitamin C with your cacao — to maximise iron absorption (a squeeze of lemon, half an orange, a few strawberries)
Use plant-based milks — dairy proteins and calcium can inhibit iron absorption
You don't need much — even small amounts of Vitamin C can make a real difference
The ritual of cacao is already so intentional. This is just one more layer of awareness to bring to it — and it means you're getting as much nutrition from every cup.