Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets vs Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps
Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets (#2, best premium) vs Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps (#3): in our L-Theanine for Calm Focus scoring the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets…
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Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets
$18.87Check price at iHerbRead full review
Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps
$15.99Check price at iHerbRead full reviewTopsFive comparison scores
Side by side
| Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets | Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps | |
|---|---|---|
| Price | $18.87 | $15.99 |
| L-Theanine Per Serving | 200 mg | 200 mg |
| L-Theanine Form | Suntheanine® enzymatically produced L-theanine | AlphaWave® highly purified L-theanine |
| Serving Size | 2 chewable tablets | 1 veggie capsule |
| Servings Per Container | 30 | 60 |
| Caffeine | 0 mg; none listed | 0 mg; none listed |
| Format / Vegan | Chewable tablets; suitable for vegans | Hypromellose veggie capsule; vegan |
| Other Ingredients | Organic cane sugar, xylitol, stearic acid, silica, natural tropical flavor, citric acid, magnesium stearate | Microcrystalline cellulose, hypromellose capsule, stearic acid, silicon dioxide |
| Testing / Certification | Isura non-GMO documentation and mass-spec lab verification; no USP/NSF certificate or downloadable current-lot COA on the page | No recognized finished-product certification or published product-specific COA linked on iHerb |
How they differ in real use
Built from our l theanine for calm focus scoring, each product's published specifications, and verified owner feedback — not hands-on testing.
Both the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets and the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps made our Top 5 L-Theanine for Calm Focus, at #2 (best premium) and #3. Its Suntheanine form, 200 mg serving, and named Isura verification are strong on the heavily weighted criteria. It ranks below the winner because of its substantially higher active-ingredient cost and added-sugar chewable formulation. The branded form and trial-aligned 200 mg dose keep it ahead of generic products. Its lack of accessible product-specific testing evidence prevents a higher rank despite otherwise strong formulation and value.
We score l-theanine for calm focus on Third-Party Testing (30%), Form & Bioavailability (25%), Dose vs Research (20%), Label Transparency (15%) and Value (10%). On that basis the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets totals 7.9 out of 10 and the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps 7. The widest gap is Third-Party Testing, where the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets scores 7 against 2 for the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps — independent certification or a published certificate of analysis. Value also separates them: 7 for the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps versus 3 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets. The Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps claws back ground on Label Transparency.
On paper, the specifications that actually differ: L-Theanine Form — Suntheanine® enzymatically produced L-theanine on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus AlphaWave® highly purified L-theanine on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps; Serving Size — 2 chewable tablets on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus 1 veggie capsule on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps; Servings Per Container — 30 on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus 60 on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps; Format / Vegan — Chewable tablets; suitable for vegans on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus Hypromellose veggie capsule; vegan on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps; Other Ingredients — Organic cane sugar, xylitol, stearic acid, silica, natural tropical flavor, citric acid, magnesium stearate on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus Microcrystalline cellulose, hypromellose capsule, stearic acid, silicon dioxide on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps; Testing / Certification — Isura non-GMO documentation and mass-spec lab verification; no USP/NSF certificate or downloadable current-lot COA on the page on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus No recognized finished-product certification or published product-specific COA linked on iHerb on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps. They match on L-Theanine Per Serving and Caffeine.
Pricing as of August 5, 2026: $18.87 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets and $15.99 for the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps, a $2.88 difference in the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps's favor. Owners praise the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets for 200 mg Suntheanine serving directly matches several human-trial doses and isura mass-spec laboratory verification and non-GMO documentation are identified; the most common complaint is costs $0.63 per 200 mg serving, the highest cost in this list. Owners praise the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps for 200 mg of branded AlphaWave in one capsule and vegan, non-GMO, gluten-free, soy-free, and caffeine-free labeling; the most common complaint is no product-specific COA or USP/NSF certification is linked on iHerb.
Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets
- 200 mg Suntheanine serving directly matches several human-trial doses
- Isura mass-spec laboratory verification and non-GMO documentation are identified
- Vegan chewable format with no caffeine
- Costs $0.63 per 200 mg serving, the highest cost in this list
- Two-tablet serving contains 3 g added sugar plus xylitol and flavoring
Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps
- 200 mg of branded AlphaWave in one capsule
- Vegan, non-GMO, gluten-free, soy-free, and caffeine-free labeling
- Fully disclosed single active without a proprietary blend
- No product-specific COA or USP/NSF certification is linked on iHerb
- Contains microcrystalline cellulose, stearic acid, and silicon dioxide
Which should you buy?
The Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets is the better fit for buyers prioritizing Suntheanine and a 200 mg labeled serving and people who prefer chewables over capsules or powder — it is the higher-scoring pick here, chiefly for Third-Party Testing. The Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps is the better fit for buyers wanting a 200 mg AlphaWave capsule and buyers avoiding caffeine, gluten, soy, and animal capsules, and the stronger choice if Value and Label Transparency matter more to you than the overall score. If the $2.88 saving matters more than Third-Party Testing, the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps is the better value. The Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets is a poor fit for buyers avoiding added sugar or xylitol; the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps is a poor fit for buyers requiring published current-lot laboratory results.
Choose the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets if
- Buyers prioritizing Suntheanine and a 200 mg labeled serving
- People who prefer chewables over capsules or powder
Skip it if
- Buyers avoiding added sugar or xylitol
- Value-focused buyers seeking a low cost per active milligram
Choose the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps if
- Buyers wanting a 200 mg AlphaWave capsule
- Buyers avoiding caffeine, gluten, soy, and animal capsules
Skip it if
- Buyers requiring published current-lot laboratory results
- Buyers seeking the lowest cost per milligram
Common questions
Is the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets better than the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps?
In our L-Theanine for Calm Focus ranking the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets scores higher overall, 7.9 to 7, with the biggest advantage in Third-Party Testing. The Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps is stronger on Value and Label Transparency, so it is the better pick if those matter most to you.
How much more does the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets cost than the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps?
$2.88 more as of August 5, 2026: $18.87 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets against $15.99 for the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps. Prices move, so the merchant page shows the current figure. What the extra buys is mostly Third-Party Testing — 7 versus 2 in our scoring.
What is the main difference between the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets and the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps?
The headline spec difference is L-Theanine Form: Suntheanine® enzymatically produced L-theanine on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets versus AlphaWave® highly purified L-theanine on the Doctor's Best, L-Theanine, AlphaWave, 200 mg, 60 Veggie Caps. In use, the gap that matters most is Third-Party Testing (7 vs 2 in our scoring): independent certification or a published certificate of analysis.