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BulkSupplements vs NOW Foods L-Tyrosine (2026)
Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
The Verdict
BulkSupplements takes it on our rubric, 88 to 84 on our 0-100 execution score, and holds our Top Pick badge in the L-tyrosine scorecard. It earns a perfect 25 on our value pillar against NOW's 23, and a full 25 on dosing and form against NOW's 22, because the powder is the only practical way to reach the 5 to 10 gram pre-stressor dose the trials used; at about $0.07 per gram, even a 7 gram dose costs roughly $0.50. NOW Foods wins our transparency pillar decisively, 23 to 19, with a plain clearly disclosed label and vegan capsules, and it carries our Best Value badge in the scorecard at about $0.11 per capsule.
In our view the honest split is by use case rather than by score: if you are taking L-tyrosine at everyday consumer doses, NOW's capsules are more convenient and the cost difference is trivial at that scale. If you want to replicate the trial protocol, capsules stop making sense and BulkSupplements' powder is the pick, with the caveats that it is bitter, dissolves poorly, and needs a scale.
L-Tyrosine Powder, 500g
BulkSupplements
L-Tyrosine 500mg, 120 Capsules
NOW Foods
Head-to-Head Comparison
| Category | L-Tyrosine Powder, 500g BulkSupplements | L-Tyrosine 500mg, 120 Capsules NOW Foods |
|---|---|---|
| Brand Score | 88/100Winner | 84/100 |
| Dosing & Form | 25/25Winner | 22/25 |
| Purity | 19/25Winner | 16/25 |
| Value | 25/25Winner | 23/25 |
| Transparency | 19/25 | 23/25Winner |
| Cost/Day | $0.07Winner | $0.11 |
| Dose/Serving | 1000mg | 500mg |
| Form | L-Tyrosine (free-form powder) | L-Tyrosine (capsule) |
| Third-Party Tested | ✓ Yes | No |
| Proprietary Blend | No | No |
Why This Comparison Matters
L-tyrosine is a case where the research dose and the consumer dose are far apart, and that gap drives this whole comparison. The trials our data cites use pre-stressor doses in the 5 to 10 gram range, which is 14 to 20 capsules for a 70kg adult on a 500mg capsule. That is impractical, and it is the reason the powder format exists.
BulkSupplements sells plain free-form L-tyrosine powder, 500g for $34.96, which works out to about $0.07 per gram with per-lot certificates of analysis published. NOW Foods sells 500mg capsules, 120 for $12.99, about $0.11 per capsule from an NPA A-rated facility with an in-house testing program.
Both are plain single-ingredient L-tyrosine, the form used in the positive trials. Neither carries independent USP or NSF certification.
Detailed Score Breakdown
L-Tyrosine Powder, 500g
BulkSupplements
Plain L-tyrosine powder makes it practical to hit the 5-10 g pre-stressor dose used in Banderet, Neri, and Mahoney
BulkSupplements publishes per-lot CoAs on their site and manufactures in a GMP-compliant facility
About $0.07 per gram, meaning even a trial-style 7 g pre-stressor dose costs about $0.50
Plain single-ingredient powder, CoAs available by request and on-site, no fillers
The pick if you want to actually replicate the Banderet/Mahoney pre-stressor protocol at 5-10 g; capsules become impractical and expensive at that dose
L-Tyrosine 500mg, 120 Capsules
NOW Foods
Plain L-tyrosine at 500mg/cap; well below the 100-150 mg/kg trial dose but the most-bought consumer dose
NPA A-rated GMP facility, in-house testing, no independent USP/NSF certification
About $0.11/day at 500mg; cheaper still per gram if you take 2-4 caps for a higher effective dose
Plain L-tyrosine clearly disclosed, no proprietary blends, vegan capsule
The workhorse pick for everyday tyrosine use at consumer doses; if you want to hit trial-level 5-10 g doses, switch to a plain powder rather than scaling capsules
How We Compared These Products
Every product in our database is scored on four equally-weighted pillars: dosing accuracy and form quality, purity verification (third-party testing), cost per clinically effective dose (not cost per pill), and label transparency. Each pillar is worth 25 points for a total of 100.
Cost per effective dose is calculated using the clinically studied dose from published research, not the manufacturer's suggested serving. If a product requires multiple servings to reach the dose used in clinical trials, that cost is reflected in the value score.
For a full explanation of our scoring methodology, see our methodology page. Prices were last checked on the dates listed for each product and may have changed.
Frequently Asked Questions
Why would I choose L-tyrosine powder over capsules?
Dose size. The pre-stressor doses in the research our data cites run 5 to 10 grams, which is 14 to 20 of NOW's 500mg capsules for a 70kg adult. At that scale capsules are impractical and expensive. At everyday consumer doses of 500mg to 2g, capsules are the easier format and the cost difference is small.
Is either L-tyrosine third-party certified?
Neither carries independent USP or NSF certification. BulkSupplements publishes per-lot certificates of analysis on its site and manufactures in a GMP-compliant facility. NOW Foods runs an in-house testing program from an NPA A-rated GMP facility. Both are plain single-ingredient L-tyrosine with no fillers or blends.
More L-Tyrosine Comparisons
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FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.