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Potassium supplements are limited to 100mg, however the RDA is 4.7g. From the foods I do eat (and will continue to do so), I get around 1.5g of potassium per day, which is way too little. However, is there something about potassium supplementation that is unsafe, or why are the supplements limited to 100mg exactly?

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    I have seen Potassium Gluconate 500mg from many brands – Robert Long Apr 18 '18 at 19:21
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    I wasn't talking about availability. Supplements are available OTC in larger doses than 500mg - I just saw one on Amazon that is 865mg and another that is 595mg. – Robert Long Apr 18 '18 at 19:54
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    amazon.co.uk/… – Robert Long Apr 18 '18 at 19:55
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    @JonathanCender Yes, you can buy it in bulk form. I happen to know quite a bit about that because I spent two years using bulk potassium to deal with a medical issue. Pure potassium chloride is a very good way to kill yourself if you don't know what you're doing. I wonder how Jack's kidney function is, if he has diabetes, or if he's taking any potassium-sparing medications. He'd better know the answers to those questions before heading down this route. – Carey Gregory Apr 20 '18 at 23:29
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1) Multivitamin-mineral supplements in the US do not contain more than 99 mg of potassium per serving to avoid overdose.

Linus Pauling Institute:

Oral doses greater than 18 grams taken at one time in individuals not accustomed to high intakes may lead to severe hyperkalemia, even in those with normal kidney function.

In individuals with somewhat impaired kidney function (without them knowing it), the toxic dose can be considerably lower.

2) Foods that contain more than 500 mg potassium per serving: avocado, jackfruit, pomegranate, dates, kiwi, banana, potatoes, beet greens, tamarind, white beans, red salmon. Foods with 300-500 mg potassium: various fruits, legumes, fish and meats.

3) Strictly speaking, 4.7 g potassium/day is not Recommended Dietary Allowance (RDA), but Adequate Intake (AI), which is believed to cover the needs of all healthy adults (Institute of Medicine). The needs for nutrients in general increase with calorie needs. This means that AI 4.7 g potassium/day is what people with the highest needs (athletes, heavy physical workers) who spend more than 4 K Calories/day may need and not necessary what average adults who spend 2-2.5 K Calories/day need.

4) Additionally, according to National Academic Press:

Given the interrelatedness of sodium and potassium, the requirement for potassium may well depend on the level of dietary sodium...

So, if you decrease your sodium intake, your potassium needs will be likely lower.

5) If studies show that high intake of foods high in potassium is associated with health benefits, this does not automatically mean that potassium supplements are beneficial. This is because it is not actually known, is it potassium or are other nutrients (calcium, magnesium) in foods high in potassium, or their combination, which is actually beneficial.

PubMed Central, 2013:

High quality evidence shows that increased potassium intake reduces blood pressure in people with hypertension.

PubMed Central, 2006:

This systematic review found no statistically significant effect of potassium supplementation on blood pressure.

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