Absorption & Bioavailability
When it comes to Magnesium supplementation, form selection is one of the most consequential decisions you can make. Different chemical forms of Magnesium vary significantly in how well your body absorbs and uses them — and L-Threonate vs Bisglycinate is one of the most commonly compared pairs.
L-Threonate and Bisglycinate share the same bioavailability tier (high (S1 — best tier)).
L-Threonate carries a bioavailability tier of S1 (high (S1 — best tier)) and is classified as T1 Preferred in the FormulaForge formulary. Bisglycinate carries a bioavailability tier of S1 (high (S1 — best tier)) and is classified as T1 Preferred.
Magnesium L-Threonate is the only form clinically shown to cross the blood-brain barrier and raise brain magnesium levels. Research at MIT demonstrated improvements in learning, memory, and cognitive flexibility — making it uniquely effective for neurological applications.
Dosing Comparison
Recommended dose ranges reflect both the potency and bioavailability of each form. Dosing data for L-Threonate is being compiled, while dosing data for Bisglycinate is also being compiled.
Because forms with lower bioavailability require a larger amount to deliver equivalent absorbed nutrient, dose ranges should not be compared interchangeably between forms without accounting for these differences. Speak with your healthcare provider to determine the appropriate dose for your goals.
Side Effects & Tolerability
Both L-Threonate and Bisglycinate are generally well-tolerated at recommended doses. Always consult a healthcare provider before starting any new supplement, particularly if you have existing health conditions or take medications.
Consult your healthcare provider before starting or changing a supplement regimen. These statements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease.
Who Should Choose L-Threonate vs Bisglycinate?
Choose L-Threonate if: bioavailability is a priority, you are focused on supporting cognitive_support function, or you want the form with the strongest formulary evidence.
Choose Bisglycinate if: bioavailability is a priority, you are focused on supporting sleep_support function, or you want the form with the strongest formulary evidence.
Speak with your healthcare provider for personalized guidance. The best Magnesium form for you depends on your individual health goals, existing nutrient status, and the dose your provider recommends.
These statements are based on structure/function research and have not been evaluated by the FDA. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.