> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Complete Guide to Magnesium Types — Which Form Is Best?

> Comparison of all major magnesium supplement forms: glycinate, malate, citrate, oxide, hydroxide, threonate, bisglycinate, taurate. Which form is best for sleep, anxiety, muscle, and energy?

There are over a dozen forms of magnesium available in supplements, each with different bioavailability, therapeutic applications, and side effect profiles. Spectrum 5 by SonoHealth incorporates the five most clinically relevant forms. This guide explains all major forms and helps you understand why the multi-form approach is superior.

## Master Comparison Table

| Form                   | Bioavailability       | Best Use                        | GI Tolerance    | In Spectrum 5? |
| ---------------------- | --------------------- | ------------------------------- | --------------- | -------------- |
| Magnesium Glycinate    | Very High             | Sleep, anxiety, calm            | Excellent       | ✅              |
| Magnesium Malate       | High                  | Energy, muscle recovery         | Very Good       | ✅              |
| Magnesium Citrate      | High                  | General health, metabolism      | Good            | ✅              |
| Magnesium Oxide        | Low-Moderate          | High elemental Mg, migraines    | Fair            | ✅              |
| Magnesium Hydroxide    | Moderate              | Digestion, regularity           | Good            | ✅              |
| Magnesium L-Threonate  | High (brain-targeted) | Cognitive function, memory      | Very Good       | ❌              |
| Magnesium Bisglycinate | Very High             | Similar to glycinate            | Excellent       | ❌              |
| Magnesium Taurate      | High                  | Cardiovascular, heart rhythm    | Good            | ❌              |
| Magnesium Chloride     | Moderate              | Topical or oral general use     | Fair            | ❌              |
| Magnesium Sulfate      | Low oral              | Acute constipation (Epsom salt) | Poor (laxative) | ❌              |
| Magnesium Aspartate    | Moderate              | General use                     | Fair            | ❌              |
| Magnesium Orotate      | Moderate              | Athletic performance, heart     | Very Good       | ❌              |

## Forms Included in Spectrum 5

### Magnesium Glycinate

Formed by binding magnesium to glycine (an amino acid). The gold standard for sleep and anxiety supplementation. The glycine component has its own calming neurological effects, making this form doubly effective for mental health and sleep. Highest bioavailability of any form — almost all of the magnesium is absorbed. Does not cause diarrhea at normal doses.

### Magnesium Malate

Magnesium bound to malic acid — a key intermediate in the Krebs cycle (cellular energy production). Specifically targeted at energy metabolism and muscle function. Best choice for athletes, people with chronic fatigue, or those with fibromyalgia. High bioavailability, gentle on the stomach.

### Magnesium Citrate

Magnesium bound to citric acid. One of the most widely studied and well-absorbed forms. Excellent for everyday supplementation, metabolic health, and mood. At very high doses acts as a laxative (used in colonoscopy prep), but at therapeutic doses is generally well tolerated.

### Magnesium Oxide

Contains the highest percentage of elemental magnesium by weight (\~60%). Despite lower bioavailability than organic forms, it contributes significant magnesium volume to the formula and is the most studied form for migraine prevention. Pairs well with higher-bioavailability forms in a blend.

### Magnesium Hydroxide

The form used in Milk of Magnesia as a laxative/antacid. In the lower doses present in Spectrum 5's blend (not standalone therapeutic doses), it contributes digestive support without causing diarrhea. Supports bowel regularity and acid neutralization in the GI tract.

## Notable Forms Not in Spectrum 5

### Magnesium L-Threonate

The only form shown to cross the blood-brain barrier in measurable quantities, making it the preferred choice for cognitive enhancement and neurological applications. More expensive. Spectrum 5 focuses on whole-body support rather than brain-specific supplementation. If cognitive function is your primary goal, consider combining Spectrum 5 with a separate L-threonate supplement.

### Magnesium Bisglycinate

Functionally very similar to glycinate — essentially the same compound. Some formulations call glycinate "bisglycinate" to indicate two glycine molecules are bound. The effects are virtually identical.

### Magnesium Taurate

Magnesium bound to taurine — preferred by cardiologists for patients with heart arrhythmias or cardiovascular concerns. Both magnesium and taurine have membrane-stabilizing effects on cardiac cells.

## Why Spectrum 5's Five-Form Combination Works

No single form covers all of magnesium's physiological roles. Consider what you'd miss if you used only one form:

| If You Only Took... | You'd Miss                                                                     |
| ------------------- | ------------------------------------------------------------------------------ |
| Glycinate only      | Energy metabolism (malate), digestion (hydroxide), migraine prevention (oxide) |
| Citrate only        | Sleep/calm synergy (glycinate), energy/ATP (malate), digestion (hydroxide)     |
| Oxide only          | High-bioavailability forms; significant portions would be poorly absorbed      |
| Malate only         | Sleep support (glycinate), digestive support (hydroxide), mood (citrate)       |

Spectrum 5's five-form blend is the rational solution — comprehensive coverage without requiring you to buy five separate products.

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**Related:** [Why Multi-Form is Better](/magnesium/vs-single-form) · [Ingredients](/magnesium/ingredients) · [vs Competitors](/magnesium/vs-competitors)