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 700mg 90 Count Vege Capsules

Product ID: 421187961

Details

Brand
Relentless
Diet Type
Vegan
Flavor
Unflavored
Item Form
Capsule
Item Weight
0.11 kg
Item dimensions L x W x H
2.5 x 2 x 2

🌱90 vegetarian capsules - clean & vegan

💊700mg per capsule - high potency

🧠Supports brain stimulation & cognition

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Description

🧠 Elevate your brain game with every capsule — don’t get left behind!

MOOD MIND HARMONY - Naturally supports mood enhancement and healthy cognitive function
CLEAN GREEN FORMULA - No magnesium stearate, 100% vegetarian-friendly for mindful supplementation
90 DAY COGNITIVE RESET - A full 3-month supply to sustain relentless mental performance
NEURO BOOSTING SUPPORT - Clinically aligned to enhance brain stimulation and neuroprotection
PRECISION PACKED POTENCY - 700mg D-Serine per capsule fuels your cognitive edge daily

Relentless Improvement’s D-Serine Amino Acid delivers a potent 700mg dose per vegetarian capsule, designed to support cognitive health, mood enhancement, and neuroprotection. Free from magnesium stearate and animal products, this clean formula is ideal for professionals seeking sustained brain stimulation and mental clarity over a 90-day supply.

Specifications

ASIN	B09TWCN545
Age Range Description	Adult
Best Sellers Rank	#6,802 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #501 in Blended Vitamin & Mineral Supplements #552 in Hand Tools (Tools & Home Improvement)
Brand	Relentless Improvement
Brand Name	Relentless Improvement
Customer Reviews	4.2 out of 5 stars 35 Reviews
Diet Type	Vegan, Vegetarian
Dosage Form	Capsule
Flavor	Unflavored
Item Dimensions	2.5 x 2 x 2 inches
Item Form	Capsule
Item Highlight	Cognitive Support, Neuroprotection Support, Mood Enhancement, No Animal Content
Item Weight	0.11 kg
Manufacturer	Relentless Improvement
Manufacturer Part Number	DSERINE_FBM
Model Number	DSERINE_FBM
Number of Items	1
Primary Supplement Type	Amino Acid, D-Serine
Product Benefits	Supports
Special Ingredients	Amino Acid
Specific Uses For Product	Brain Stimulation Treatment Support, Cognitive Support, Mood Enhancement, Neuroprotection
Supplement Formulation	Individual Supplement
Total Servings Per Container	90
UPC	854463005412
Unit Count	90 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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56680CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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