Pyridoxine Hydrochloride
Pyridoxine Hydrochloride is a unrated form of Vitamin B6 (Pyridoxine), used in 13,006 on-market products and providing 82.3% elemental vitamin b6 (pyridoxine) by weight.
13,006
on-market products
unrated
quality tier
82.3%
elemental fraction
Basis: pyridoxine free base MW 169.18 / pyridoxine HCl MW 205.64 (confirmed PubChem formula)
Why this tier: Requires oxidation/phosphorylation in the liver to become the active coenzyme PLP -- a plausible basis for tier differentiation, but no verifiable head-to-head human bioavailability RCT vs P5P was located; the widely-repeated "P5P is more bioavailable" marketing claim is not confirmed.
Source: uncertain -- needs review (no primary source found for this specific comparison)