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Description
Doctor's Best Suntheanine L-Theanine 150mg, 90 CapsulesDoctor's Best Suntheanine L Theanine 150mg, 90 Capsules is a dietary supplement formulated to provide L Theanine, an amino acid derived from green tea leaves. Each capsule contains 150 mg of Suntheanine, a patented form of L Theanine that is produced through a fermentation process designed to replicate the natural L Theanine found in tea. The product aims to support relaxation and reduce stress without causing drowsiness. It is intended for use by
Doctor's Best Suntheanine L-Theanine 150mg, 90 Capsules is a dietary supplement formulated to provide L-Theanine, an amino acid derived from green tea leaves. Each capsule contains 150 mg of Suntheanine, a patented form of L-Theanine that is produced through a fermentation process designed to replicate the natural L-Theanine found in tea.
The product aims to support relaxation and reduce stress without causing drowsiness. It is intended for use by adults seeking to enhance their mental clarity and focus while promoting a sense of calm. The supplement is free from gluten and soy and is suitable for vegetarians.
The recommended dosage is one capsule daily, or as directed by a healthcare professional. The capsules are designed for easy swallowing and optimal absorption.
Ingredients include L-Theanine, microcrystalline cellulose, modified cellulose (vegetarian capsule), and silicon dioxide. The product does not contain artificial additives, preservatives, or colorings.
Doctor's Best is known for rigorous quality control and scientific research backing, ensuring that each batch of Suntheanine L-Theanine is consistent in quality and potency. The supplement is manufactured in the United States in facilities that comply with Good Manufacturing Practices (GMP).
Note: This product is not intended to diagnose, treat, cure, or prevent any disease. Consult with a healthcare provider before starting any new supplement, particularly if you have a medical condition, are pregnant, or are nursing.
For more information on usage and potential interactions, refer to the product packaging or visit the Doctor's Best website.
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4.2 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 5
Great modest, minimalist digital watch: 2 time zones, Indiglo, subtle hourly chime
Color: Purple/Silver-Tone
Great value and this is nice, low-key but functional and sleek timepiece. I bought it to replace an older Ironman (bulkier) watch that finally reached end of life after LOTS of adventures (still functions, but strap and face just really couldn't be taken into corporate or social settings without expectation of some heckling). I REALLY like most of the new features (especially the dual time zones, hourly chime (can toggle on/off), and Indiglo applied to the numbers/text rather than as background), I probably would have switched to this earlier if I had known of them. Slight negative that the hourly chime toggle is nested within the time setting workflow, so can't just nearly instantly switch it when heading into movie/performance/other setting where want to silence it fully. I can't speak to the water resistance of this one yet, have been taking it off to shower and haven't been swimming yet. (Taking it off to shower in part because had seen other reviews noting that the trim around the dial may not be long-lasting. So out of caution to extend its appearance, I'll probably remove it for salt/chlorinated water swims (not timing laps)). Only other aspect should note is that the feature that helps to "lock" the strap band at end (bit of a nub to catch) is bit tricky when putting it on / taking it off, may be even more so for those with arthritis or other condition that would make it extra challenging/frustrating to maneuver and engage.
Quite happy with it overall though, just a slight annoyance when putting on / taking off (which may not apply for most if they just leave it on).
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Reviewed in the United States on January 17, 2023
★★★★★ 3
Good Everyday Watch - But Scratches Easily!
Color: White/Chrome-tone, Color: White/Chrome-tone
This is exactly the watch I was looking for. I needed a basic watch that is waterproof, can also act as a stopwatch, I don’t need to charge, and hold up to regular wear and kid activities. Set up was incredibly easy and didn’t need any directions. The size and style are slim and sleek making it easy to wear under just about anything or wear to bed. I’ve had Iron Man watches in the past that I’ve loved. I lost my recent one hence this replacement. I’m hopeful that this watch can hold up to every day wear and not have any of the wristband or chipping issues as other users have seen. Will come back to update the review after a few weeks of wear.
3/19/26: Back for an update. Watch function is still great but the face of the watch gets scratched so easily. I questioned these reviews when I ordered the watch thinking, “how bad could it be?” And they’re right. Super easily scratched. I have no idea how I even scratched/damaged mine. Doesn’t affect function but frustrated that it happened within a month of use/wear. I suppose you get what you pay for - very disappointing for well known brand such as Timex. Lost two stars for this sole reason.
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Reviewed in the United States on February 12, 2026
★★★★★ 3
Functionally not bad, but style is meh
Color: Blue/Rose Gold-Tone, Color: Blue/Rose Gold-Tone
Likes:
Very easy to read with the large numbers/characters
The “indiglo” lighting seems to efficient in dark/dim light
Dislikes:
Setup is not easy. It did not come with instructions.
Watch time lags behind
Find the watch a little uncomfortable on the wrist
I need a watch for the clinical portion of my schooling. This watch is not terrible. The display is easy to read and the indiglo light displays well. Ultimately, I’ve decided to return it. I wish it had instructions. I got by enough to set the correct time and date, but it appears there are two times you can preset it to. So maybe you can have one set as one time zone & the other another time zone. I was going to set one as normal time and the other as military time, but couldn’t figure out how to set which preset you want to currently display, so I just set both as the same exact thing.
I like a different watch, also purchased from Amazon, better for myself after comparing it to this timex. I just don’t care for the look of this one. It looks a bit too juvenile. My sister described it well as a watch she “would have worn as late elementary/middle schooler” and I agree. I have a feeling that maybe it doesn’t come across as such in the white. White was my first choice, but other reviews mentioned the band dirtying and not being able to remove stains/coloring, so I went with this blue band color. Also, something about the watch was a bit uncomfortable while wearing it and I have a hunch settling in to wearing it more would not solve that discomfort much, if at all. Also, I initially set the watch 2 minutes early against the time on my phone. But it’s now days later and I noticed it runs behind the time on my phone by about 30 seconds. Both the watch I compared to this one and this timex itself claim to be water resistant, but I have not tested those claims with any hand washing or anything. I trust they’ll be fine in that sense. Also haven’t tried the alarm/stopwatch features as they’re not exactly needs of mine. Overall, I like that the look of the watch I like better in comparison will not only serve its purpose for my schooling just fine, but it also looks less kiddy, was cheaper, and actually came with instructions. If all you care about is big easy to read characters and don’t mind if your watch time ends up being a little behind, this timex is fine. If you want/expect more/different than that, maybe keep looking elsewhere because you can probably find more of what you’re seeking out and possibly even cheaper than this timex.
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Reviewed in the United States on September 30, 2021
★★★★★ 5
Perfect for Training (Swimming) Purposes.... 5 Star for what it does as a training watch!
Color: Black/Yellow
This is already my 2nd TIMEX which I use for my swimming practices..
This one beats the older model (Timex 51931 Ironman Triathlon) with some interesting changes:
1) The larger digits on this model makes it easier to read the numbers (as some mentioned to do so when running) even when I am swimming, with a quick flick of the wrist at the turn, it's possible to see the minutes and the seconds.... The older model had smaller number, thus not making it possible to do this.
2) The navigation on this model became quite easier. It was already easy on the older model but this one included instructions on screen, such as NEXT, DONE, + or - in order to advance with your practices and training... Plus a chance to change the way you want to see the information of the your laps (Laps in the big digits and splits at the smaller one, or the oposite)
A Real nice add on by TIMEX.
3) A simple but effective wrist band "clip" (the tiny piece of strap that attachs the "extra" wrist band that is left after you put the clock on)
It has a piece of rubber on the inside that locks on at the wrist band and does not make it loose or even letting it go as some other watches do sometimes. This is more effective underwater I think, as it remains the way you set your wrist, as the older model I had did not quite held in place all the time.
4) Plenty of memory (100 laps is really a nice number), maybe more then most will need but, as a swimmer I use to count splits over 100m (or yards) with many laps during one training... It is quite usefull. I go easily on 10 to 15 laps of the memory in one training.
And with the date feature, that reminds when you did these times, it is quite usefull to keep track on the training with a spreadsheet, for instance... (as I do !)
5) A really big START/SPLIT buttom that is great to press when I am swimming laps and have to press myself at each turn at the pool.
Just perfect. Never a miss !
And the feature which was already at most of the models, of the repeat countdown, and the start of a chrono, or a repeat (what I use the most) in order race agains your average rhitym inside a certain time frame that you can set it up ! And of course the flix technology, which is very good to have it... Just flick your wrist (when you set it to ON) and it will show you at night all info that you need.
It is another great watch from TIMEX and it deserves a look, specially for the price. It is worth to pay a bit more if you are like me and uses a lot of the memory for the laps on swimming pool. Maybe for runners it can be quite a lot of memory, but the price difference is worth the change, for some of the options mentioned at this review.
This is a really good watch to have..
Will you definatelly like as we all are at these reviews.
:-) It deserves the 5 stars rating !
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Reviewed in the United States on January 10, 2009
★★★★★ 5
Great sports watch.
Color: Black/Yellow
I have to admit to being a bit of a watch fiend, having one for almost everything I do, but this is one of the most useful, yet cheaper priced items I've come to enjoy. When I work out I like as much information as I can get, so for running and biking I have a watch for that, but for swimming I needed a watch to help me count my laps and log my times. The Timex Ironman 100-lap watch does this quite well. I first got a Timex 50-Lap watch that I was able to find locally, but 50 laps is very limiting so when I found this watch for less money and a bigger face that had the lap/split time and lap number on the screen at all times I knew I had a great product. When you're finished with your laps just save your workout. The watch will then calculate some information like average lap time and best lap. I haven't completely messed with their data, but I think they average your times by throwing out the lap times that are the outliers, which is good for the accidental laps where you hit the wrong button, but it's not as great when you did a few sprint laps and they don't show up as your best time. If your best time isn't on there you can still recall it by going through each lap individually, but I think my sprint laps sometimes aren't listed as my best laps. I haven't messed with this feature much because it isn't important to me, and removing the outliers is good for looking at your actual pace. I have been able to push myself a bit more in the pool by having actual numbers to compare, which is very helpful. The other features on this watch I haven't used much, but for someone who can't afford a GPS watch and can use maps or a track this watch would be great for running or anything with laps or intervals.
It has up to 9 interval timers and once finished it can either stop or repeat the sequence. It can do what's called chrono at the end, where it just switches to the chronograph feature after your timer or interval timers are finished. Overall this is a great watch and for most people who enjoy doing anything with laps look no further.
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Reviewed in the United States on July 5, 2012
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