If you want to check whether your current bisglycinate is pure, you have three options:

1. The ingredient list: Does it list magnesium oxide? Then it is buffered.
   
   
2. The ratio: Magnesium bisglycinate always contains about 10–14% elemental magnesium. If a brand does not state this percentage or does not list the original magnesium amount (e.g. 833mg magnesium bisglycinate = 100mg elemental magnesium) you cannot assume it is pure.
   
   
3. The amount:
   💊 Capsules: We use 12% bisglycinate, and we can just fit 100 mg of elemental magnesium into a standard 00 capsule while running the machine slower. If a capsule contains much more than 100 mg, includes other large ingredients, or has noticeable empty space left, the bisglycinate is likely not pure.
   
   ⚪ Tablets: For tablets, it's a bit trickier, but still possible. We need to divide the amount of elemental magnesium by the total weight of the tablet. Let’s use 150mg of elemental magnesium with the theoretical maximum of 14.1%:
   
   150 / 14.1% = 1,064mg
   
   Keep in mind that fillers are necessary in tablets, which can account for 10–40%. Since bisglycinate is hygroscopic (it attracts moisture), it’s harder to work with and often requires more fillers. If we assume 20% filler:
   
   1,064 / 80% = 1,330mg
   
   So, if your tablet weighs less than 1,330 mg, it’s probably mixed with oxide. This calculation of course doesn't account for a higher percentage of fillers or other ingredients in the tablet (e.g., taurine), which may contribute to the weight.