Calcium-Rich Oat Milk

This is a creamy and slightly sweet home-made oat milk – a doddle to make so you never run out! Some people don’t tolerate cow’s milk and there has been a massive upsurge of interest in plant-based milks over the past few years.

However, commercial oat milks are usually very low in calcium or fortified with types of calcium that are hard to absorb easily. Many oat milks also have emulsifiers and acidity regulators added to them which are often not tolerated by sensitive tummies. Some people also need gluten-free oat milk or prefer organic which can get expensive.

I have therefore created a super easy oat milk you can make at home that contains a very special type of calcium made from marine algae, which is vegan and also packed with minerals that help to build healthy bones. This makes 1 litre of oat milk with 1,200mg calcium. 100ml of cow’s milk normally provides 120ml calcium.

This milk is suitable from 12 months old and should never be used as a replacement for infant milk formula.

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Calcium Rich Oat Milk

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Prep Time 5 minutes
Total Time 5 minutes
Course Drinks
Servings 4 people
Suitable for Special Diet (or adaptable) Dairy-free, Egg-free, Gluten-free, Vegan, Vegetarian



  • Blend all the ingredients in a high-speed blender for 30 seconds. Be careful not to over blend.
  • Strain through a fine sieve into a jug or glass bowl – let this drip through slowly and discard any oats of thick liquid remaining in the sieve after a couple of minutes. Do not be tempted to push these through as this can make the milk quite slimy.
  • Wash the sieve and strain the oat milk once again so it becomes extra smooth and creamy. Again, discard any oats or thick liquid remaining, if you want to keep it as palatable as possible.
  • Store in a covered jug or sealed glass jar for up to 5 days in the fridge.
  • The liquid and oats will naturally separate, so do give it a good stir each time you pour it.


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  1. Thank you. We currently use rude health but it is expensive like you said. My daughter has Cows Milk Protein Allergy so I’m always keeping an eye out fir how to increase calcium. She also has a histamine intolerance. Would your recipe be OK for that? Many thanks

  2. Hi, I usually take “Together” calcium from purified seaweed capsules. Woukd I be able to substitute these or is there a reason I should use these specific calcium capsules please? Thank you.

  3. Hi! Can I add the correct amount of capsules to PLENISH milk if I need a quick fix for my son with CMPA? I really struggle with finding organic low sugar mills for him (we don’t live in the UK)

    1. Yes just as much as you might give your children bought oat milk or other plant milks – can be used in baking, porridge, milk shakes or for drinking straight

  4. Thank you for highlighting the importance of calcium. Once its been added to the oat milk can it be heated up? My daughter loves warm milk. Thank you

    1. The Vitamin D in fortified foods and drinks is usually minimal and this is partly why the government recommend that everyone (except for babies consuming more than 500ml of infant formula) takes at least 400iu Vitamin D as a food supplement between October and March in the UK. You could in theory add one 400iu tasteless drop to 120ml/1 small glass of oat milk on the day you are going to consume it.

      1. It seems Vitamin D is necessary for the absorption of calcium.

        1 cup of the store brand Oatly has 20% of Vitamin D added to it (~144 IU)

        From the site:

        “The body needs vitamin D to absorb calcium…. Experts recommend a daily intake of 600 IU of vitamin D up to age 70.”

        I found this site with more details on adding calcium, vitamin D and B12