Free L-tyrosine powder canon · N-acetyl NALT better BBB · capsule convenience low doses.
USP plant-fermented powder · canon RCTs
Best for
Ideal use: cognitive stress · high doses 100-150 mg/kg · budget.
Advantages
Form used in Hase, Mahoney, Magill RCTs. Affordable · 7-10 g/dose easy powder. Bulk Powders, Now Foods.
Disadvantages
Slightly bitter taste. Warm water dissolution. BBB limited vs NALT.
Acetylated better water solubility + BBB
Best for
Ideal use: BBB optimization · capsule dose convenience · travel.
Advantages
Water solubility improved 30%. BBB cross 2× vs free L-tyrosine. Lower capsule dose. Jarrow NALT 350 mg standard.
Disadvantages
Expensive (~€25-35/month 350 mg/d). Limited head-to-head studies vs free L-tyrosine.
Free-form capsules controlled dose
Best for
Ideal use: hypothyroidism low dose 1000-1500 mg · maintenance.
Advantages
Travel convenience · no water/measuring required. Controlled dose.
Disadvantages
Expensive to reach 7-10 g/dose (14-20 capsules). For acute stress powder better.
Ideal use: cognitive stress · high doses 100-150 mg/kg · budget.
Ideal use: BBB optimization · capsule dose convenience · travel.
Ideal use: hypothyroidism low dose 1000-1500 mg · maintenance.
Free L-tyrosine powder canon · N-acetyl NALT better BBB · capsule convenience low doses.