BulkSupplements.com Magnesium Glycinate Powder - Magnesium Supplement for Bone & Muscle - Gluten Free - 1250mg (225mg of Magnesium) per Serving, 800 Servings (1 Kilogram - 2.2 lbs)

It does have a fishy smell but it is great not to have my muscles cramping on me.

This product is mostly magnesium oxide, not glycinate. If you check the ingredients they'll tell you it's a mixture of glycinate and oxide without specifying the ratio. Glycinate is expensive while oxide is cheap, but practically useless unless you want to use it as a laxative. When you mix this in water, most of the mixture turns into clumps. Now glycinate is highly water soluble whiles oxide is not. This tells me most of what you get in this product is NOT magnesium glycinate and likely oxide or some other filler. This powder is only good as a laxative.

The title of my review should not be construed as a problem with the supplier Bulk Supplements. I consider this product to be a commodity with inherently unavoidable characteristics. See also my in-depth answer to the posted question: "Does this dissolve in water?" The water supplied by our local utility is quite soft. When I vigorously agitate the labeled serving 1/4 tsp of this powder in 12 fl oz of Brita filtered tap water (boiling) I observe that almost all of the powder remains undissolved. After the powder particles settle, a flocculent remains suspended. Next, I try a sip of this mixture and there is a sharp, pungent taste of ammonia. Having some chemistry knowledge, I knew that flocs form as a result of pH conditions. I also knew that aqueous ammonia is alkaline. So I tested a hypothesis that an acid solution might completely dissolve a given quantity of this powder, and also simultaneously release its ammonia into the atmosphere. It turned out that 2 Tbs of boiling white vinegar (labeled as 5% acidity) was just enough to completely dissolve 3/8 tsp of this powder while preventing flocculation and avoiding dissolution of ammonia. This enables 245 mg of elemental magnesium to be absorbed via an empty stomach. But I will instead choose to consume magnesium citrate powder, even though it too is practically insoluble in water. I experimentally discovered that 11/16 tsp can be completely dissolved in just 1 Tbs boiling vinegar. Thus it has approx 5.5 times the solubility of magnesium glycinate (in vinegar). Moreover, it contains 16% elemental magnesium, whereas magnesium glycinate contains only 14% elemental magnesium. So 11/16 tsp of the citrate powder has 383 mg of magnesium. Considering that the gycinate powder is denser than the citrate powder, in order for the glycinate powder to match that I would need just 0.59 tsp of it. But... The magnesium glycinate must first be dissolved in 4.7 Tbs boiling vinegar. No, thank-you. Perhaps this product should be regarded first and foremost as a source of glycine rather than primarily as a source of magnesium. However, beef gelatin is also a source of glycine, and its ammonia (if present; probably not) is low enough so as to be tasteless. Moreover, it's easily dissolved in boiling water, obviating the need for vinegar, which is corrosive to tooth enamel. But its dry granules have a glycine content of only 27%, compared to this product's glycinATE content of 86%. Suppose I consume 1 Tbs of beef gelatin granules (after dissolving them in boiling water). I would be getting 2.6 g glycine. In order to match that in glycinATE, I need only consume 0.64 tsp of this product, but the caviat is that it must first be dissolved in a little over 5 Tbs boiling vinegar. Again, no, thank-you. In summary, the alternatives to this product are not only inexpensive, they are also more effective (superior solubility) and are FAR SAFER (This item is contaminated with ammonia and at least one insoluble powder). So if magnesium is the reason for your consideration of this product, then magnesium citrate is the better choice. Or if glycinate is what you're after, then choose gelatin granules instead of this item.

I originally bought this product assuming, based on the description, that it was pure magnesium glycinate. It wasn’t until I noticed how poorly it dissolved that I went back and checked the nutrition label more carefully. Turns out it’s not pure magnesium glycinate at all – it’s mixed with magnesium oxide, and the label doesn’t clearly state what proportion is which. Judging from how much of it doesn’t dissolve, it feels like a pretty high amount of magnesium oxide. I feel seriously misled by this and consider it extremely dishonest branding. This experience has completely destroyed my trust in this brand, and I won’t be buying any of their products again.

NOT MAGNESIUM GLYCINATE (it’s a compound that mixes oxide and glycinate, oxide is not very bioavailable). This product is also awful. Entirely undrinkable. Likely very high levels of oxide over glycinate. Very disappointed.