NOW Foods Glycine Pure Powder vs Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free

Q: Which is better, NOW Foods Glycine Pure Powder or Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free?

NOW Foods Glycine Pure Powder scores 78.0/100 while Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free scores 76.0/100 in our analysis. NOW Foods Glycine Pure Powder is the higher-rated product overall.

Q: Is NOW Foods Glycine Pure Powder worth the price compared to Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free?

NOW Foods Glycine Pure Powder scores 88.0/100 for value, while Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free scores 62.0/100. Check our price comparison above for the latest UK prices.

Side-by-side comparison of scores, ingredients, prices and real customer feedback for NOW Foods Glycine Pure Powder and Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free.

Last verified: 07 Apr 2026 · Based on 36 reviews

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78.0

Quick Answer

NOW Foods Glycine Pure Powder scores 78.0/100 vs Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free at 76.0/100. NOW Foods Glycine Pure Powder wins on ingredient quality, value for money, side effects. Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free is stronger on effectiveness.

How Do the Scores Compare?

NOW Foods Glycine Pure Powder

Nutricost L-Theanine 200mg,...

	NOW Foods Glycine Pure Powder NOW Foods	Nutricost L-Theanine 200mg,... Nutricost
Overall Score	78.0	76.0
Effectiveness	68.0/100	82.0/100 Best
Ingredient Quality	84.0/100 Best	75.0/100
Value for Money	88.0/100 Best	62.0/100
Side Effects	91.0/100 Best	90.0/100
Certifications	77.0/100 Best	58.0/100
Best Price	View →	£7.84 Amazon UK → Cheapest
Price per Serving	N/A	£7.84 1 servings
Form	Powder	Capsule
Dose	1000mg glycine per serving	2.2 Ounces
Third-Party Tested	✓ Yes	✗ No
Reviews Analysed	20	16

NOW Foods Glycine Pure Powder

Pros

✓Genuinely pure single ingredient — no fillers, binders, or additives of any kind
✓Outstanding value: 454 g tub provides 151+ full therapeutic (3 g) sleep doses
✓GMP-certified and NPA A-rated manufacturing with third-party testing
✓Mildly sweet natural taste makes it easy to mix into water or a drink

Cons

✗Each serving is only 1 g — the clinically studied sleep dose (3 g) requires three scoops, which is not clearly flagged on the label
✗General NOW Foods quality concerns circulate on Reddit (notably regarding their magnesium glycinate), creating brand-level uncertainty even where product-specific evidence is absent
✗Authenticity questions raised by at least one long-term user who noticed label variation between batches purchased online
✗Powder format is less convenient than capsules for on-the-go use

Best For

People seeking evidence-based sleep quality improvement without melatonin Those wanting to boost dietary glycine for collagen and skin support Budget-conscious buyers who prefer powder over capsules Vegans and individuals with multiple food allergies needing a clean supplement Older adults interested in glycine's role in glutathione production and healthy ageing

Amazon UK View →

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Nutricost L-Theanine 200mg, 120 ...

Pros

✓Strong anxiety and stress reduction reported across the majority of reviews
✓Highly effective for smoothing caffeine jitters and improving focus quality
✓Notable sleep improvement, especially when combined with magnesium glycinate
✓Well-tolerated with no side effects reported across all 12 reviews

Cons

✗Price flagged as expensive relative to equivalent products on the market
✗Sleep benefits may take 4–6 weeks to fully manifest for some users
✗Third-party testing claimed in marketing copy but contradicted by product specs
✗Not vegan — capsule shell may contain gelatin

Best For

Coffee and pre-workout users seeking to eliminate jitters Light sleepers or those with difficulty switching off at night People managing mild to moderate daily anxiety or stress Nootropic stackers looking for a clean calming base Anyone sensitive to sedating sleep aids who wants a gentler alternative

Amazon UK £7.84

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What does the data say about NOW Foods Glycine Pure Powder vs Nutricost L-Theanine 2...?

NOW Foods Glycine Pure Powder Winner 78.0/100

NOW Foods Glycine Pure Powder is a single-ingredient amino acid supplement delivering 1 g of free-form glycine per quarter-teaspoon serving from a 454 g tub.

Effectiveness

NOW Foods Glycin..

68.0/100

Nutricost L-Thea..

82.0/100

Ingredient Quality

NOW Foods Glycin..

84.0/100

Nutricost L-Thea..

75.0/100

Value for Money

NOW Foods Glycin..

88.0/100

Nutricost L-Thea..

62.0/100

Side Effects

NOW Foods Glycin..

91.0/100

Nutricost L-Thea..

90.0/100

Certifications

NOW Foods Glycin..

77.0/100

Nutricost L-Thea..

58.0/100

What are the key differences?

NOW Foods Glycine Pure Powder is best for: People seeking evidence-based sleep quality improvement without melatonin, Those wanting to boost dietary glycine for collagen and skin support

Nutricost L-Theanine 20.. is best for: Coffee and pre-workout users seeking to eliminate jitters, Light sleepers or those with difficulty switching off at night

Frequently Asked Questions

Which is better, NOW Foods Glycine Pure Powder or Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free? ▼

NOW Foods Glycine Pure Powder scores 78.0/100 overall while Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free scores 76.0/100. NOW Foods Glycine Pure Powder comes out ahead, scoring higher on effectiveness (68.0 vs 82.0). NOW Foods Glycine Pure Powder is best suited for People seeking evidence-based sleep quality improvement without melatonin and Those wanting to boost dietary glycine for collagen and skin support. Nutricost L-Theanine 200mg, 12 is better for Coffee and pre-workout users seeking to eliminate jitters and Light sleepers or those with difficulty switching off at night.

Is NOW Foods Glycine Pure Powder worth the price compared to Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free? ▼

For value, NOW Foods Glycine Pure Powder scores 88.0/100 vs Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free's 62.0/100. NOW Foods Glycine Pure Powder delivers better value relative to its quality. Note that NOW Foods Glycine Pu comes as powder while Nutricost L-Theanine is capsule, which may affect your preference.

Which has fewer side effects? ▼

NOW Foods Glycine Pure Powder scores 91.0/100 for side effects (higher means fewer reported issues) while Nutricost L-Theanine 200mg, 120 Capsules, Double Strength - Non-GMO, Gluten Free scores 90.0/100. Reviewers report fewer side effects with NOW Foods Glycine Pure Powder. For certification and testing, NOW Foods Glycine Pu scores 77.0/100 vs Nutricost L-Theanine's 58.0/100. Always consult a healthcare professional before starting any supplement.

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Disclaimer: AIScored provides data-driven comparisons based on publicly available reviews. This is not medical advice. Affiliate links may earn us a commission at no extra cost to you.

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