Relentless Improvement: do you self test the purity of overseas ingredients before production of D-Serine?

When the active arrives we sample it and send it out to a third-party analytical testing laboratory based in the USA. The material is quarantined until test results are received back. **As is required for GMP compliance.**

Is this made in the usa? is it based on porcine aka pig, or shell fish?

The active is not available from USA suppliers. As you are well aware, our high-tech manufacturing was gutted and shipped offshore decades ago. Downstream of the active, all remaining manufacturing and testing is USA. The is no porcine, or shellfish.

Relentless Improvement: do you third party test the purity of overseas ingredients before production of third D-Serine?

As required under GMP, yes. OF COURSE. We have conducted full third-party testing since we began business 17 years ago, before it was required by law. I'll also point out, 99% of actives used by ALL supplement companies come from "overseas" as USA manufacturing was gutted decades ago.

For anyone who's tried both L-Serine & D-Serine, did D-Serine really achieve better results?

Because D-Serine has a poor absorption rate orally one must take a lot. I gave to my wife for three months when recovering. I don't know how well it worked but I would do again.

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D-Serine - Amino Acid for Cognitive and Neuroprotection Support & Mood Enhancement - No Animal Content 90 Count 700mg Vege Capsules

D-Serine - Amino Acid for Cognitive and Neuroprotection Support & Mood Enhancement - No Animal Content 90 Count 700mg Vege Capsules

Product ID: 421187961

Details

Brand
Relentless
Flavor
Unflavored
Item Form
Capsule
Item Weight
0.11 Kilograms
Item dimensions L x W x H
2.5 x 2 x 2
Product Benefits
Supports

🌱90 plant-based vege capsules, no animal content

🔬Rigorous multi-stage US lab testing

🧠700mg pure D-Serine per capsule

Description

🧠 Elevate your mind, naturally — clarity and calm in every capsule!

LAB TESTED FOR PEAK PURITY - Every batch undergoes rigorous third-party testing to guarantee potency, safety, and zero contaminants.
TRANSPARENCY YOU CAN TRUST - No proprietary blends, full ingredient disclosure, and FDA-approved claims keep you informed and confident.
PURE PLANT POWERED NEURO SUPPORT - 90 vege capsules crafted without animal products or fillers for clean, conscious supplementation.
COGNITIVE CLARITY IN EVERY CAPSULE - 700mg of premium D-Serine fuels sharper focus and mental agility.
FAMILY OWNED QUALITY DIRECT TO YOU - From sourcing to delivery, enjoy unmatched consistency and freshness with a brand that values your relentless health journey.

Relentless Improvement’s D-Serine supplement delivers 700mg of pure amino acid per plant-based capsule, designed to support cognitive function, neuroprotection, and mood enhancement. Manufactured in the USA with full GMP compliance, it features no animal content, no magnesium stearate, and undergoes rigorous third-party testing for purity and potency. Transparent labeling and a direct-to-consumer model ensure premium quality and uninterrupted supply for professionals seeking a sharper, calmer mind.

Specifications

ASIN	B09TWCN545
ASIN	B09TWCN545
Best Sellers Rank	#139,611 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #108 in Nippers & Snips #6,822 in Blended Vitamin & Mineral Supplements
Brand Name	Relentless Improvement
Customer Reviews	4.2 4.2 out of 5 stars (31)
Date First Available	March 4, 2022
Flavor	Unflavored
Item Dimensions	2.5 x 2 x 2 inches
Item Form	Capsule
Item Weight	0.11 Kilograms
Item model number	DSERINE_FBM
Manufacturer	Relentless Improvement
Manufacturer	Relentless Improvement
Manufacturer Part Number	DSERINE_FBM
Model Number	DSERINE_FBM
Product Benefits	Supports
Product Dimensions	2.5 x 2 x 2 inches; 3.92 ounces
Special Ingredients	Amino Acid
Total Servings Per Container	90
UPC	854463005412
Unit Count	90.00 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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