NA can instead be transported by SLC5A8 and SLC22A13 74,75 , while SLC7A5 and SLC36A4 are required for uptake of Trp 71,72
The goal of retaining lean muscle mass and strength should not be limited to avid gym gurus
It is generally recommended to take L-carnitine between meals to avoid direct competition with other dietary amino acids for intestinal transporters
Studies show Alpha GPC can elevate acetylcholine levels in as little as 12 hours after intake[2 Trusted Source 1992 - International Journal of Clinical Pharmacology, Therapy, and Toxicology A comparative study of free plasma choline levels following intramuscular administration of L-alpha-glycerylphosphorylcholine and citicoline in normal volunteers ]
Where each stands and what the data shows The reported results put them in a rough order on efficacy, though cross-trial comparisons are not definitive
Furthermore, in LOX-/- mice, Pischon et al (40) found reduced osteoblast differentiation and insufficient mineral crystallization