California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules vs Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets
California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules (#1, best overall) vs Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets (#2, best premium): in our L-Theanine for Calm Focus scoring the California Gold Nutrition, L-Theanine,…
We may earn a commission when you buy through our links. Prices and availability shown are accurate as of Aug 5, 2026 and are subject to change; the merchant's price at purchase applies.
California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules
$9.43Check price at iHerbRead full review
Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets
$18.87Check price at iHerbRead full reviewTopsFive comparison scores
Side by side
| California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules | Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets | |
|---|---|---|
| Price | $9.43 | $18.87 |
| L-Theanine Per Serving | 100 mg | 200 mg |
| L-Theanine Form | AlphaWave® highly purified L-theanine | Suntheanine® enzymatically produced L-theanine |
| Serving Size | 1 capsule | 2 chewable tablets |
| Servings Per Container | 60 | 30 |
| Caffeine | 0 mg; none listed | 0 mg; none listed |
| Format / Vegan | Hypromellose veggie capsule; vegan | Chewable tablets; suitable for vegans |
| Other Ingredients | Microcrystalline cellulose, hypromellose capsule, stearic acid, silicon dioxide | Organic cane sugar, xylitol, stearic acid, silica, natural tropical flavor, citric acid, magnesium stearate |
| Testing / Certification | Published iTested report for lot 3533; Eurofins and ABC Testing; report dated 2018 | Isura non-GMO documentation and mass-spec lab verification; no USP/NSF certificate or downloadable current-lot COA on the page |
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 California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules and the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets made our Top 5 L-Theanine for Calm Focus, at #1 (best overall) and #2 (best premium). It has the best weighted balance of branded form, label clarity, published product-specific evidence, and price. Its roughly 25,000 iHerb reviews reinforce buyer trust, but quality criteria—not popularity—drive the rank. 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.
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 California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules totals 8.3 out of 10 and the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets 7.9. The widest gap is Dose vs Research, where the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets scores 9 against 7 for the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules — per-serving dose versus doses used in published human trials. Third-Party Testing also separates them: 8 for the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 7 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets.
On paper, the specifications that actually differ: L-Theanine Per Serving — 100 mg on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 200 mg on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets; L-Theanine Form — AlphaWave® highly purified L-theanine on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus Suntheanine® enzymatically produced L-theanine on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets; Serving Size — 1 capsule on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 2 chewable tablets on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets; Servings Per Container — 60 on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 30 on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets; Format / Vegan — Hypromellose veggie capsule; vegan on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus Chewable tablets; suitable for vegans on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets; Other Ingredients — Microcrystalline cellulose, hypromellose capsule, stearic acid, silicon dioxide on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 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. They match on Caffeine.
Pricing as of August 5, 2026: $9.43 for the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules and $18.87 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets, a $9.44 difference in the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules's favor. Owners praise the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules for branded AlphaWave L-theanine with 100 mg fully disclosed per capsule and published product-specific iTested report lists a 100 mg HPLC potency result; the most common complaint is 100 mg is the bottom of the requested research-dose range. 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.
California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules
- Branded AlphaWave L-theanine with 100 mg fully disclosed per capsule
- Published product-specific iTested report lists a 100 mg HPLC potency result
- Vegan capsule with no caffeine and broad allergen exclusions
- 100 mg is the bottom of the requested research-dose range
- Available iTested report is dated 2018 and does not document the current lot
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
Which should you buy?
The California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules is the better fit for buyers prioritizing branded L-theanine plus a published product-specific report and buyers wanting a 100 mg premeasured serving — it is the higher-scoring pick here, chiefly for Third-Party Testing and Value. 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, and the stronger choice if Dose vs Research matters more to you than the overall score. Since the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules is both the higher scorer and $9.44 cheaper, the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets only makes sense for buyers prioritizing Suntheanine and a 200 mg labeled serving. The California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules is a poor fit for buyers wanting 200 mg in one capsule; the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets is a poor fit for buyers avoiding added sugar or xylitol.
Choose the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules if
- Buyers prioritizing branded L-theanine plus a published product-specific report
- Buyers wanting a 100 mg premeasured serving
Skip it if
- Buyers wanting 200 mg in one capsule
- Buyers requiring a certificate matching the current lot
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
Common questions
Is the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules better than the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets?
In our L-Theanine for Calm Focus ranking the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules scores higher overall, 8.3 to 7.9, with the biggest advantage in Dose vs Research. The Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets is stronger on Dose vs Research, so it is the better pick if that matters most to you.
How much more does the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets cost than the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules?
$9.44 more as of August 5, 2026: $18.87 for the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets against $9.43 for the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules. Prices move, so the merchant page shows the current figure.
What is the main difference between the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules and the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets?
The headline spec difference is L-Theanine Per Serving: 100 mg on the California Gold Nutrition, L-Theanine, Featuring AlphaWave, 100 mg, 60 Veggie Capsules versus 200 mg on the Natural Factors, Stress-Relax, Suntheanine L-Theanine, 100 mg, 60 Chewable Tablets. In use, the gap that matters most is Dose vs Research (7 vs 9 in our scoring): per-serving dose versus doses used in published human trials.