Comparisons
Two forms, one decision. Each comparison states what the evidence supports, what it does not, and how the label numbers convert.
- Folate vs Folic Acid: What the Evidence Actually Shows
Folic acid is the only folate form with neural tube defect trial evidence behind it. The 2020 label rule changed the unit, and half of US labels hide the math.
- Magnesium Glycinate vs Magnesium Citrate: What the Evidence Actually Shows
Citrate has real human absorption data. Glycinate has almost none. No trial has compared the two head-to-head, and citrate's elemental content depends on the salt.
- Magnesium Glycinate vs Magnesium Oxide: What the Evidence Actually Shows
Magnesium oxide carries 4x more elemental magnesium per mg, but the only head-to-head trial found no absorption difference. What labels don't tell you.
- Magnesium L-Threonate vs Glycinate: The Numbers Behind the Brain Claim
L-threonate labels declare 7.2% elemental magnesium against bisglycinate's 14.1%. Five human trials exist, and the only publicly funded one found nothing.
- Probiotics vs Prebiotics: What the Definitions Actually Require
Probiotics are live microbes, prebiotics their fuel. But half of US probiotic labels name no strain, and no product we checked reached a prebiotic dose.
