Source Naturals · L-tyrosine · Tablets
Is Source Naturals L-Tyrosine 500 mg underdosed?
1 serving = 1 tabletDirections: 1 serving a dayLabel as of 23 Aug 2023 · NIH DSLD
Verdict
500 mg a dayas the label directs
Not gradedContains 500 mg. Not graded: a 2023 meta-analysis found no effect on endurance; its evidence is for focus under stress, at about 150 mg per kg of bodyweight.
One tablet gives 500 mg.
What the label says
- L-Tyrosine per serving
- 500 mg in 1 tablet
- Servings a day
- 1 serving a day
- L-Tyrosine a day, as directed
- 500 mg
- Research dose
- Not graded Evidence: Not graded
Suggested Use: 1 tablet daily.
Also on the label
| Ingredient | Per serving | Verdict |
|---|---|---|
| Calcium | 114 mg | Not graded |
More about l-tyrosine: forms, timing and the studies behind the dose.
Same category, compared
All 11 L-tyrosine supplements we checked, ranked by dose (commission never changes the order).
| Product | Per serving | Form |
|---|---|---|
| Doctor's Best L-Tyrosine 500 mg | 500 mg | Capsules |
| Jarrow Formulas L-Tyrosine 500 mg | 500 mg | Capsules |
| Momentous Tyrosine | 500 mg | Capsules |
| NOW L-Tyrosine 500 mg | 500 mg | Capsules |
| NutraBio L-Tyrosine | 500 mg | Powders |
| Nutricost L-Tyrosine 500 mg | 500 mg | Capsules |
| Nutricost L-Tyrosine Powder | 1 g | Powders |
| Pure Encapsulations L-Tyrosine | 500 mg | Capsules |
| Source Naturals L-Tyrosine 500 mg (this product) | 500 mg | Tablets |
| Swanson L-Tyrosine 500 mg | 500 mg | Capsules |
| Thorne L-Tyrosine | 500 mg | Capsules |
Where the reference doses come from
- L-Tyrosine, : .
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 295959, including its servings a day.
For a supplement taken every day we judge the most the label's directions give in a day, and show the least. Read the full methodology or the corrections log.