Calamansi, or limau kasturi, is in almost every Malaysian kitchen. It goes into sambal, noodles and iced drinks. A clinical trial in Thailand that began in May 2026 is testing calamansi capsules on blood sugar and insulin in 54 healthy young adults. There are no results yet.

So is calamansi juice good for you? Yes, as part of a normal diet: it is a cheap source of vitamin C. Here is what is known, and how to make it with a slow juicer in Malaysia.

What is in calamansi juice

Calamansi is a small citrus fruit, also called calamondin. A 2023 review in the journal Molecules (published April 2023) looked at what is known about it. It calls calamondin juice "an inexpensive vitamin C source". It also lists about 7.3 mg of vitamin C in each fruit.

That is a small amount per fruit, because the fruit is small. A glass of juice uses many fruits, so the vitamin C adds up. Calamansi also gives a sharp, sour taste, which means a little goes a long way.

Is calamansi juice good for you?

As part of a normal diet, yes. It is a cheap, local way to add vitamin C and fresh flavour to a drink.

The 2026 trial is still running, so nobody can yet say what calamansi does for blood sugar. For now, enjoy it for its taste and its vitamin C.

The bigger gain often comes from what you leave out. Many stall-style calamansi drinks are sweetened with syrup. When you make it at home, you decide how much sweetness goes in, or skip it.

Why make it with a slow juicer

Most people squeeze calamansi by hand. That works for one or two fruits. For a full jug, or for mixing calamansi with other fruit, a slow juicer saves your hands.

A slow juicer presses the fruit with a turning screw at a low speed. The juice runs out smooth, and the pulp (the dry fibre left after juicing) and seeds go to a separate cup. It is also quiet, so you can make a jug early in the morning. Our page on juicer noise in condo living explains why that matters in a flat.

How to prepare calamansi for a slow juicer

Calamansi skin is thin but bitter, like most citrus rind. Peel it before juicing, so the bitter oil in the rind stays out of your glass.

1. Wash the calamansi and pull off any stems.
2. Peel them by hand or with a small knife.
3. Leave the small seeds in. A slow juicer pushes them out with the pulp.
4. Feed the peeled fruit in with a firmer fruit, such as apple, pineapple or cucumber. The firm fruit helps push the small pieces through the screen.

If peeling feels slow, there is a shortcut. Juice the main fruit in the slow juicer, then cut a few calamansi in half and squeeze them into the glass by hand.

Three easy calamansi juice ideas

• Calamansi and apple. Two apples and eight to ten peeled calamansi. Sweet and sour, with no sugar needed.
• Calamansi and pineapple. A thick slice of pineapple and six peeled calamansi. Bright and tropical.
• Calamansi and cucumber. One cucumber and six peeled calamansi, topped up with cold water. Light and cooling.

Taste before you add any sweetener. With sweet fruit in the mix, most people find they do not need it. Our list of local fruits a slow juicer can handle has more fruit to pair with it.

Picking and storing calamansi

Calamansi is sold green in most Malaysian markets. Green fruit is sharp and sour. As it ripens, the skin turns yellow or orange and the juice gets a little milder. Both work for juice, so choose by the taste you like.

Pick fruit that feels firm and heavy for its size, with smooth, shiny skin. Dry or wrinkled fruit has less juice inside.

Keep calamansi in a bag in the fridge so they stay fresh longer. If you buy a big bag, you can peel a batch and freeze the peeled fruit in small portions. Thaw a portion fully before you juice it with your apple or pineapple, because frozen fruit gives little juice.

Caring for your teeth

Calamansi juice is acidic, like lime and lemon juice. Drink it with a meal, and rinse your mouth with water afterwards. Our guide on whether lime juice is good for you covers these simple habits in more detail.

Choosing a slow juicer in Malaysia

If citrus juice will be a habit, choose a machine with a fine screen that rinses quickly, and parts that are easy to take apart. See how to deep clean a slow juicer screen to know what upkeep looks like.

When you are ready, you can compare slow juicers in Malaysia and choose one that suits the drinks you make most.

Frequently asked questions

Is calamansi juice good for you?

It is a cheap source of vitamin C, according to a 2023 review in the journal Molecules. Making it at home also lets you skip the syrup used in many stall drinks.

How much vitamin C is in calamansi?

The 2023 review lists about 7.3 mg of vitamin C per fruit. A glass of juice uses many fruits, so the total adds up.

Do I need to peel calamansi before juicing?

Yes, for a slow juicer. The rind is bitter, so peel the fruit first and feed in only the flesh.

Can calamansi seeds go into a slow juicer?

Yes. The small seeds leave with the pulp. Remove any stems first.

Is calamansi juice good for blood sugar?

That is still being studied. A trial that started in May 2026 is testing calamansi capsules, and it has no results yet. Ask your doctor if you need to manage your blood sugar.

What fruit goes well with calamansi juice?

Apple, pineapple and cucumber all work well. They add body to the juice and balance the sour taste.