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Magnesium Hydroxide Powder

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Price From: FROM $11.96

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Magnesium Hydroxide Powder


  • Pure powder
  • Easy on the stomach
  • Promotes bone health
  • Taste

  • Mixability

Magnesium hydroxide, also known as milk of magnesia, is a mineral commonly used as a gentle laxative. It's also a natural antacid for heartburn relief, a topical treatment for canker sores, and may promote clear skin. Many deodorants contain magnesium hydroxide as an antiperspirant agent.


Serving Size & Timing

This supplement is recommended to be taken in serving sizes of 1000mg per day. This is equal to about 1/4 tsp total. The FDA recommends that Magnesium be taken in servings of 400mg per day. And since this solution contains 42% Magnesium, consuming 1000mg of the total supplement will equal about 420mg, just a little bit more than the FDA recommended daily value for adults.

Because of this supplement’s strong effects, it is recommended that no other medication be taken within one to two hours of taking this, as the Magnesium Hydroxide present in the stomach may cause the drug to not be absorbed correctly.

It has also been shown that the efficiency of Magnesium supplementation increases greatly when taking Calcium supplements along with it. For best results, it is recommended that Magnesium be consumed at a 1:2 ratio with Calcium. If taking 420mg of Magnesium with this supplement, you should also be taking 840mg calcium in order to balance out the effects.

Nutritional Information

Supplement Facts

Serving size: 1000 milligrams
Serving per container: *
Amount Per Serving % Daily Value**
Magnesium (as Magnesium Hydroxide)...417 mg 104%
* Daily Value not established.
** Based on 2,000 calorie diet


Sugar, Soy, dairy, yeast, gluten,corn and additives

As a magnesium supplement, take 1000 mg (1/4 tsp) daily, or as directed by physician.

US Standard Measuring Spoons
Spoon Size(level) milligrams
1/8 teaspoon 518
1/4 teaspoon 1036
1/2 teaspoon 2073


Magnesium Hydroxide Concentration

Magnesium hydroxide comes in the form of a fine powder and it has no fillers of any kind present in it. It contains 42% elemental magnesium which is a very high concentration.

Magnesium Hydroxide Side Effects

As long as suggested serving sizes are adhered to, Magnesium Hydroxide should be safe to take. However, taking too much may cause adverse side effects such as diarrhea, which can rapidly deplete the body’s supply of potassium. Muscle cramps may subsequently develop and inhibit the adsorption of iron and folic acid.

Those who have or have had severe kidney issues are recommended to make absolutely sure not to overdose on the total Magnesium content, as this could exacerbate their condition or cause it to resurface. Those who are healthy and have not been recommended this supplement by a doctor are advised to not take it for more than one week. If any side effects such as rectal bleeding or constipation occur or are still present, immediately discontinue use and call a doctor. These are usually indicative of another kind of serious condition that is not associated with this supplement.

The elderly and those that are already taking Magnesium-rich medications or supplements must consult a doctor before using this product.


This product is not very soluble in water. While this does make consumption a bit more complicated, it also means that it functions as a strong electrolyte, which may be of some use to those that work out often. This product should be stored in an area that is free from light, heat and moisture in order to preserve its potency.

California residents: Click here for Proposition 65 warning.

Customer Reviews

upset stomach
This product seems to really help my horse that has stomach ulcers I will be reordering it again. *

On 4/29/2019 Mark said...

Magnesium Hydroxide
I found that Bulk Supplements carries the best supplements.The Magnesium Hydroxide really works for what I need if for in my body.Great product and great price of anywhere I have shopped,thanks Bulk Supplements for your great products.*

On 4/26/2019 Cheryl said...

Great Product for Magnesium Bicarbonate!
Bulk Supplements was recommended to me for their purity and quality and I can easily say that their reputation is well deserved. I was pleasantly surprised at how fast I received my shipment and this exact product is great for making magnesium bicarbonate. I will be returning for this and other products, thanks!*

On 12/5/2018 Scott M said...

Great product for deodorant
I have been working on a natural deodorant that works for the masses. This has been an active ingredient in all of the final tests. I was actually surprised at how well it works in all forms I have tested. I even tested it dusted as is and while I had a limited physical day, I only had to apply it twice. This is also the only place I really can find this. As far as the company, I received my order 2 days after ordering. The 2nd time I have ordered and have been beyond happy with the shipping and process. *

On 10/16/2018 Plague Dr said...

I am so glad you offer this!
I make deodorant with this and it works well. *

On 10/10/2018 Anna said...

Magnesium Hydroxide
I've been using Magnesium Hydroxide to make Magnesium bicarbonate to add to water and it has worked very well in the formulation. It feels good to have a pure form without the need to use milk of magnesia. I'm glad I found this before buying the chemical laden second option in milk of magnesia. *

On 9/9/2018 Brandon said...

Magnesium Hyderoxide
This product is great and good for so many issues. I've ordered it several times and wouldn't go to bed at night without it. Keeps me regular and helps me sleep are two big reasons to take it. I just put a scoop in my mouth, follow with water and then then calcium powder. *

On 4/17/2018 Donna said...

Perfect deodorant choice
I made Leda Lum YouTube video deodorant recipe using this ingredient. It works so perfectly. Best ingredient. The other magnesium burns the underarm when it's freshly shaved. *

On 8/18/2017 Crystle said...

Mg(OH)2 .... Remarkable!
'Googled' magnesium hydroxide for more information before using. Turns out this stuff is essentially the active ingredient for Phillips Milk of Magnesia, TM. I have not seen this stuff in the OTC selections at any pharmacy for awhile - might be there though since I really wasn't looking for this specific item .... but I almost always browse the aisles when I am there with my bride.

However when I take this supplement in the quantity recommended I DID notice a definite change in my GI tract if I am experiencing any difficulties there. Definitely an unexpected pleasant addition with the magnesium supplementation.

I usually stir it into plain seltzer water: doesn't dissolve completely ... but stirring the mix gets most down the throat.*

On 7/11/2017 Andrew said...

Magnesium Hydroxide
Pure white powder with no needed preservatives or fillers. Much better than getting magnesium from milk of magnesia products that have added chlorine in the form of sodium hypochlorite!
I mix one half teaspoon with four tablespoons of vinegar to get a great magnesium supplement that in my opinion is even better than the more expensive magnesium threonate supplements that I had taken for the previous 5 years.*

On 6/28/2017 William said...

A good combination with seltzer water
Combined with seltzer water magnesium hydroxide is said to become a carrier of oxygen and help neutralize carbonic acid. Bulk Supplements is one of few sources where magnesium hydroxide in small quantities can be purchased. I find the company to offer good customer service and responsive to any requests I have made. *

On 5/18/2017 Larry said...

Magnesium Hydroxide - 500g Pure Powder
I use it with my club soda machine. No noticeable taste & mixes easily.*

On 5/15/2017 John Hughes said...

Favorite Supplement on the Market
Your Magnesium Hydroxide Powder is a fast acting supplement that has reduced the ache in in my lower back and sore joints after only one application. I take it (1/4 tsp.) with a glass of water (10-12 ozs.) in the morning and am good to go (literally) all day. It's relatively a tasteless product, odorless and dissolves easily in the water with a couple of additional shakes. I usually mix it in a quart plastic bottle with purified water. Plus, the customer service was top notch and delivery was on time. *

On 4/4/2017 david said...

Added it to my magnesium stack
From what I understand we are all probably low on magnesium and I am trying to get magnesium in all forms. Love Bulk Supplements purity.*

On 10/24/2016 sylvia said...

Mag Hydroxide Powder
I'm going to try this in order to make Mag Bicarb water. We all need plenty of Mag. I had kidney stones and read that this will help avoid them, so we'll see if that is true. I certainly don't want to use anything like MoM and get other nasty junk with it, so hoping to avoid those with this powder. *

On 10/4/2016 K No said...

Magnesium Hydroxide Pure Powder
I ordered this to use in my cosmetic manufacturing. I am very pleased with the quality and happy to find a source for a pure product with no fillers. I will re-order for sure. *

On 5/23/2016 Ryan said...

Magnesium Hydroxide Powder
Great to find a reliable source without additives. Good packaging, prompt delivery.*

On 5/17/2016 Gabriel said...

Great quality!
Thank you! I love the quality, it really is clean & pure! The packaging is great! I'm so glad your company exists!!! *

On 4/17/2016 Heather said...

Great stuff!
Virtually tasteless. Makes great Magnesium Bicarbonate water. Actually I was able to double the amount suggested in the Afibbers recipe. Not sure why, but still had some carbonation left. Makes Magnesium much more digestible.*

On 2/27/2016 Timothy said...

Magnesium Hydroxide Powder
This powder is virtually tasteless which is a welcome change from the milk of magnesia I was using.I now use this to make Mag water.I am finally able to enjoy the drink.I will also use as toothpaste and deodorant instead of the milk of mag.Shipping was fast.Very nice customer service.*

On 1/31/2016 esther said...

Magnesium Hydroxide Powder
This magnesium powder arrived quickly and packaged very well.
The powder is clean and pure. Can be used for multiple purposes, as in above reviews. I love this company and will continue to look here before any other place when I need supplements. I had several questions and they were answered very quickly by customer service. I also love that you can read thru the reviews and get so much info from the experiences of others regarding uses Thanks!*

On 7/16/2015 Mickey said...

Great for making Magnesium Bicarbonate water
I've been making my own Magnesium Bicarbonate water ( and was using Milk of Magnesia (which is essentially just Magnesium Hydroxide suspended in water, bottled and sold at any local drugstore). It was quickly becoming apparent that I didn't need to spend the extra money on retail bottles of Milk of Magnesia when I could simply get this pure Magnesium Hydroxide powder and use it instead. The product arrived quickly, was packaged securely and works quite well in the recipe, and saves a lot of time and money over buying retail bottles of Milk of Magnesia.*

On 6/10/2015 loess said...

"Magnesium hydroxide" effects after the first dose
This magnesium hydroxide is smooth tasting making it easy to take with water. I think taste is somewhat important if I'm intending to continue to take a supplement a regular basis.
It seems too relax me after my first dose, when normally I'm up all night. After trying it, I slept with no but too be continue.
I also notice that my eyes are no longer bloodshot but clear in the morning.
It seems to have some real good effects. I mention the relaxation, normally my lower back keeps me from sleeping, so I kinda went online to find some possible relief for the pain. And I think magnesium hydroxide is one the supplements that is doing the most help so far (relaxation).
Good Product *

On 2/27/2015 ST said...

Magnesium Hydroxide in deodorant recipe
Apparently Magnesium Hydroxide is generally used for constipation issues. I discovered that it can also be used in making homemade deodorant. It absolutly works! My homemade deodorant works significantly better than any commercial deodorant I have ever used! Thank you Bulksuppliments for putting out an exceptional product! I am highly impressed. *

On 8/8/2014 cau2great said...

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Product Questions

How is this supplement powdered? Micro ionized? Nano powder? or just straight up powder? Thank you!