Customer Ratings & Reviews

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4.7

Based on 5,926 ratings

4,950

609

266

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What customers say

Customers generally find Jarrow Formulas PS100 effective for cognitive support, memory enhancement, and reducing brain fog. Many users report improved sleep quality and reduced cortisol levels when combined with Holy Basil. The product is appreciated for its high potency (100 mg per softgel), easy-to-swallow size, and soy-free formulation using sunflower lecithin. Some customers experienced relief from neuromuscular symptoms like BFS. However, a few users did not notice significant effects. Trust in the brand varies; some long-term users express dissatisfaction with recent changes, while others continue to trust its quality and effectiveness. The product is recommended by naturopathic doctors and arrives well-packaged from iHerb.

Review highlights

Top positive review

iHerb customer

Silver

Posted on Jan 13, 2025

Australia

166

217

High Quality but Expensive

This stuff is excellent quality and soy free which is awesome. I wish it didn't have ascorbyl palmitate in it though as that can be an allergy trigger for people like me with MCAS. It's also WAY more expensive that other similar offerings of sunflower PS 100mg on iHerb, and in my experience I've noticed no difference at all switching between the different brands in the different price brackets. I have nothing against this one (except maybe the ascorbyl palmitate) but I typically choose Lake Avenue or Nutricost versions these days because they're so much more affordable.

(5,858)

Greenhue

Posted on Jan 20, 2026

United States

Great product!

Verified purchase

Great product! Have been taking it for many years and it helps!

iHerb customer

Posted on Nov 19, 2025

United States

Jarrow Formulas PS 100

Verified purchase

I cannot say enough for how much this helped a relative that had Dementia. He got more alert, could think and speak much better from using this. The best part is that it is NOT a drug. It is incredible!!!

BlackNova

Gold

Posted on Oct 27, 2025

Thailand

508

105

Verified purchase

Jarrow Formulas PS100 is a high-quality supplement that delivers phosphatidylserine in a reliable and well-formulated capsule. The ingredients are clean and focused, featuring 100 mg of phosphatidylserine per serving derived from sunflower lecithin, with no unnecessary fillers or artificial additives. The capsule size is small and easy to swallow, making daily use convenient. Overall, it offers excellent quality and consistent potency in a compact, user-friendly package.

iHerbCustomer

Posted on Oct 18, 2024

Philippines

2,107

Verified purchase

Thank you for providing such outstanding supplements! The quality is exceptional, with thoughtfully selected ingredients that offer remarkable health benefits. Your products have made a significant positive impact on my overall well-being. I also appreciate the secure and reliable packaging. Thanks again, iHerb!

Elka

Silver

Posted on Sep 25, 2025

Ukraine

155

Verified purchase

Helps me control my higher thrombocyte count in check. Apparently PS100 marks them for removal. My T count has been slightly elevated for years, with no objective reasons for it other than potential development of essential thrombocythemia (ET). I had an increased number of immature granulocytes (IG), which is not considered a solid marker of ET, yet it's not normal for them to be elevated. So PS100 normalized my IG count in the blood. With each subsequent test they disappeared. Hard to say what is going on, but I take it as a good sign and that it helps me stray away from the potential blood disease I was heading towards.

iHerb customer

Gold

Posted on Oct 13, 2025

Singapore

1,765

Verified purchase

I started taking this to help manage my stress levels, and it has made a noticeable difference in my ability to stay calm under pressure. My mind feels less cluttered, and I'm sleeping more soundly through the night. The softgels are small and easy to swallow with my other daily supplements. It's become an essential part of my routine for maintaining mental clarity and a sense of calm.

iHerbCustomer

Gold

Posted on Oct 3, 2025

Singapore

862

120

Nice

Verified purchase

Jarrow PS100 is a solid cognitive-support product. Great for someone who wants to support memory, focus, or mental stamina without strong stimulants. Especially useful during busy work periods, times with high mental load or stress. Good packaging and size. Best used with consistency (daily or near-daily), and paired with good sleep, diet, maybe other supportive nutrients (omega-3s, etc.). If you’re soy-sensitive, the clumping issues bother you, or you want faster-acting effects, you might look around at alternatives (especially sunflower-lecithin PS versions). Effect is gradual: It’s not an “instant brain boost” kind of product. Benefits (better memory, sharper thinking, less fog) show up only after consistent use. Taste is ok.

SomebodyAlex

Silver

Posted on Mar 23, 2022

290

Verified purchase

Phosphatidylserine is a supplement I take for better cognitive functions. It definitely improves memory and focus as well as short-term awareness. Effect is lasting also if one stops with Phosphatidylserine. Jarrow brand has a budget option at a great price as other brands are more pricy. Dosage is fine but 30 softgels run out fast as, to begin with, one needs to take more of them. Ingredients or source of Phosphatidylserine is safe sourced from sunflower. The size of softgels is convenient and easy to consume

Silver

Posted on Mar 21, 2024

Germany

127

154

Effective and High-Quality Phosphatidylserine Supplement

Verified purchase

I recently tried the "Jarrow Formulas, PS 100, Phosphatidylserine" supplements, and I must say, I am highly impressed with the results. This product has proven to be both effective and of excellent quality. The soft gel pills are convenient to take and have a smooth texture, making them easy to swallow. I appreciate the thoughtfulness put into the design of the pills, as they are gentle on the stomach and do not cause any discomfort after consumption. As for the effectiveness of the supplement, I have noticed a significant improvement in my cognitive function and overall mental clarity since incorporating it into my daily routine. Whether it's enhancing focus during work hours or supporting memory recall, this product has consistently delivered positive results. What sets this supplement apart is its high-quality formulation. Jarrow Formulas is known for its commitment to using premium ingredients, and the PS 100 Phosphatidylserine supplement is no exception. 30 soft gels can be a good amount for trying out a new supplement and assessing its effectiveness for personal use. It allows for a sufficient duration to gauge how well the product works for you without committing to a larger quantity upfront. This size is often ideal for product testing or for those who prefer to purchase smaller quantities initially. It's a practical approach to ensure that the supplement meets your needs and expectations before making a more substantial purchase.

iHerb customer

Posted on Apr 18, 2026

Saudi Arabia

Прекрасно!

Verified purchase

Quality is super! The ingredients are great! Size arranged! What you need! Performance is felt! the product arranged, perfectly packed, the effect is definitely there! I will order more! Just as quickly delivered

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