Magnesium hydroxide vs. magnesium oxide.
Above it says milk of magnesia is magnesium oxide, whilst wikipedia says it is magnesium hydroxide. Above it is more negative about hydroxide than the oxide form.
"Sea natural "magnesium forms
If anyone doesn’t enjoy me ripping holes in product claims as much as I do, please skip this…
I found this on wininhealth, maybe that’s your sort?:
“What makes sea-sourced magnesium the perfect magnesium? Sea water has an amazing similarity to the plasma portion of human blood. Although we cannot drink sea water because of its salt content, it does contain the entire range of minerals needed by humans. This led an Irish company to develop a method of extracting these minerals from clean sea water to make the multi-mineral complex called Aquamin Mg that is low in sodium. Then Aquamin Mg was compared to other forms of magnesium. For example, magnesium oxide is the most potent, but not well absorbed. Magnesium chloride is well absorbed but low in magnesium content. Aquamin Mg was found to offer the best of both. It was several times more soluble and absorbable than magnesium oxide. And since it contained 33 percent of elemental magnesium, more potent than the chloride version.”
This idea by “an Irish company” (Certified Naturals) is obviously not medical and goes without any logic.
Even if sea water were similar to plasma why should this make it a good source. Should we not then drink plasma instead?! Even if sea water had the entire range of minerals, it wouldn’t be in the right doses. If this were an argument, shouldn’t they include it in Aquamin Mg, as they even say (“multi-mineral”?)? However it only contains magnesium. Two types combined to one. That apparently makes it “multi”. I’m glad they added it’s low in sodium, just in case someone believes they’re getting more than magnesium, or at least not all the entire range of minerals, but “all but sodium”? Whoops, where’s the amazing similarity to plasma gone?
So what about the sorts. “Magnesium oxide is the most potent, but not well absorbed” - ehm, sorry, that’s a contradiction in terms. It’s usually said to be 4% bioavailable, so almost none. And it isn’t the most potent, it is the compound with most content of elemental magnesium, around 60%. It’s a bit like trying to eat pure magnesium, which is a white metal - not gonna work. It’s often put in combinations to slow down the rate of absorption. I prefer spreading the capsules instead.
Magnesium chloride it’s true is better: good for viral stress, diseases, heartburn, constipation, replenishing. Topically for muscle soreness (but there’s little evidence for skin absorption).
But looking at what the product page (also on wininhealth) says is actually in it - it’s Magnesium hydroxide = Mg(OH)2 which has poor absorption, and is laxative, so is not recommended by some webpages. However wikipedia says this form is “milk of magnesia”, other websites say the oxide MgO is milk of magnesia. Probably because they’re so related, MgO just needs water added. Obviously wininhealth calls this form oxide (combined with chloride), whilst the company calls it hydroxide and doesn’t mention the chloride form. According to wikipedia the hydroxide form is easily so cheaply industrially extracted from sea water, which makes it even more dubious that this is anything special.
Like chloride and oxide hydroxide is an anorganic form rather than organic or chelate like the ones I recommended above. And that makes it as “natural” as rocks (mineral, like salt and the minerals we need), but not as natural as plasma (biological with mineral content).
As fillers the cellulose causes the least problems for most, while I avoid silicon dioxide and magnesium stearate whenever I can.
Side effects stated on the product: “Some people may experience diarrhoea.” True.
Finally, the company claims “Aquamin MgTM is a marine-source magnesium and mineral matrix extracted from fresh Irish seawater.” - I think I’m right in saying “matrix” just refers to the “natural” origin instead of a synthetic production and would only be relevant if there were several minerals, rather than just the hydroxide. As said, a lot of the (hydr)oxide is extracted from sea water, that’s nothing special. Maybe the seawater being Irish is the key to it all. So glad it was fresh, who knows what’d’ve happen if it were stale and mouldy … or polluted even…
My main problem is: Where has the slightly better magnesium chloride now gone that wininhealth mention - it’s not in the company’s formula! (any more?)