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Using Magnesium Bitterns

Our bitterns contain liquid magnesium chloride and magnesium sulphate, both readily absorbable forms of magnesium. The best way to absorb magnesium is through your gut. Our bitterns are 30–40% absorbed, which contrasts with around 5% for magnesium oxide. They also contain smaller amounts of potassium, copper, boron, zinc and calcium as well as trace amounts of other minerals.

One ml of Ancient Lakes Magnesium bitterns (approximately 15 drops) provides 30 per cent of your recommended daily intake of magnesium.

As their name suggests, our bitterns are very bitter! They also have a strong mineral taste because they are so concentrated. We take our bitterns in a small glass of juice or sparkling water, or add them in the morning to our water bottle to sip throughout the day.

Please consume our bitterns along with a healthy, balanced diet rich in fruit, vegetables and whole grains.

What is the laxative effect?

Your gut will only absorb the magnesium that your body needs. If you take more magnesium than your body requires the excess magnesium will stay in your gut. As magnesium attracts water, this can cause a laxative effect.

The laxative effect is your best tool for determining your optimal dose of magnesium. We recommend starting with a low dose – around 10 drops per day, and increasing gradually until you experience the laxative effect. When this happens, just reduce your dose until the effect stops.

In this way you are in control of how much you take, and your body will tell you how much it needs. This may vary over time, as many lifestyle factors (diet, alcohol intake, stress etc.) influence your rate of magnesium excretion.

How much magnesium bitterns can I take?

Adults: Start with up to 10 drops added to water, juice or food daily. Increase gradually 2–3 drops per day until tolerance is reached (up to 3.5ml / 50 drops per day).

While our bitterns are completely safe, there are recommended tolerable upper intake levels for supplemental magnesium. Please consult the table below to ensure you stay within the guidelines.

Tolerable Upper Intake Levels (ULs) for Supplemental Magnesium






Birth to 12 months

None established

None established

1–3 years

65 mg

65 mg

4–8 years

110 mg

110 mg

9–18 years

350 mg

350 mg

350 mg

350 mg

19+ years

350 mg

350 mg

350 mg

350 mg


We recommend that you discuss any form of dietary supplementation with your doctor, especially if you have any health conditions. People with impaired kidney function must consult their doctor before taking supplemental magnesium.

Nutritional Information

Nutrition Facts

Serving size (1 mL)

Amount Per Serving

Calories 0


Total Fat

0 g


98.5 mg


8.7 mg


7.5 mg


0.041 mg


0.006 mg


0.002 mg


11.7 mg


270 mg


35 mg

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