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-セリン

Product ID: 735149005

Details

Brand
Relentless
Dosage Form
カプセル
Flavor
アンフレーバー
Item Form
カプセル
Item Weight
0.11 Kilograms
Item dimensions L x W x H
6.4 x 5.1 x cm

🌱90 vegecaps, clean & stearate-free

💊700mg pure D-Serine per capsule

🧠Supports cognitive clarity & mood

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Description

🧠 Elevate your mind, own your day with D-Serine!

MOOD MIND HARMONY - Clinically aligned to support healthy cognition and emotional balance for your busy lifestyle.
PURE COGNITIVE BOOST - Each capsule delivers a potent 700mg of D-Serine, fueling sharper focus and mental agility.
CLEAN GREEN FORMULA - 90 vegetarian capsules crafted without magnesium stearate for a pure, natural supplement experience.
TRUSTED BY PROFESSIONALS - Backed by a 4.2-star rating and designed by Relentless Improvement for those who demand more.
FLEXIBLE DOSAGE FOR PEAK PERFORMANCE - Take 3-4 capsules daily, or up to 6-8 for enhanced benefits tailored to your needs.

D-Serine by Relentless Improvement is a premium, vegetarian supplement delivering 700mg of pure D-Serine per capsule. Designed to support cognitive function and emotional well-being, it comes in a clean formula free from magnesium stearate. Ideal for professionals seeking enhanced mental clarity and mood balance, with flexible dosing options and trusted quality.

Specifications

ASIN	B09TWCN545
ASIN	B09TWCN545
Brand Name	Relentless Improvement
Customer Reviews	4.2 4.2 out of 5 stars (23)
Dosage Form	カプセル
Flavor	アンフレーバー
Item Dimensions	6.4 x 5.1 x 5.1 cm
Item Form	カプセル
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
Number of Items	1
Product Dimensions	6.35 x 5.08 x 5.08 cm; 111 g
Specific Uses For Product	感情的なサポート
UPC	854463005412

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How is product pricing calculated?+

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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$U8583

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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