NATURAL STACKS Smart Caffeine Pills - 100mg Caffeine + 200mg L-Theanine Supplement - Supports Energy and Focus - No Jitters and No Crash - 60 Capsules

Are you exhausted and mentally plus physically worn out? Life can do that to you and sometimes you need a little boost of caffeine energy to get through another day. I was feeling emotionally worn out from dealing with a situation that was not resolving itself and I was having low motivation to get things done. Then I remembered I had these capsules and figured one couldn't hurt. I will say these do give you an energy that is more long lasting and it didn't make me feel anxious or wired and I felt no crash besides that I ended up going to bed a little earlier that night. I'd say from the time I took one capsule to the moment I got active was about 20 minutes. I cleaned my whole kitchen, did several loads of laundry and did other things around the house that needed to be done. I literally felt like all the negative emotions I'd been feeling dissolved into a sense of happiness and peace. I will however say that you don't want to take these if you are not near a restroom because I found out these have a diuretic effect like coffee. Make sure to drink plenty of water even if you only take one capsule. I am not a doctor, nor is this medical advice. Some people also can't handle much caffeine due to heart or anxiety issues. So use with caution. But overall I felt these were safe enough for me and did give me more energy than a cup of coffee. I personally would not take more than one capsule at a time during a day and would not take these every single day. I consider these more a last resort when I'm really low on energy or feeling emotionally drained. For that they work like a miracle! ~The Rebecca Review

As with some of the other posters who mentioned a headache or feeling the need to take a nap mid-day when beginning this product, I felt the same way. However, I kept going with it and I no longer experience those symptoms. I assume it is your body's way of adjusting to the supplement and shift in caffeine type. Just like with anything there is an adjustment period. Now this is all I need to get me through the day. I no longer have crashes and can steadily focus on my work without the need to make tea or coffee every morning that involves sugar, which I have been off of now for 4 weeks.

Currently trudging my way through grad school while working, and often find myself with low energy and unable to focus. Must be the lack of sleep huh? Wrong. Despite being extremely busy, I usually average about 6-8 hours of sleep per night, the exact same amount I had before I went back to grad school. Because of this, I figured I would get something relatively natural and low impact to help increase my energy and focus. I opted for this particular brand because the reviews were pretty good, the packaging and marketing looked rather legit ( I know this may seem like a crazy thing to go off of, but with vitamins if they look like they belong in an infomercial, I feel nervous.) and the price was right. I got them in the mail, and within a week I noticed that I had increased energy, and after two weeks I saw that it was even more intensified. With that said, I still hadn’t seen any improvement in focus, so I decided to “stack” (new supplement lingo I learned from a guy at a health foods store) another supplement, called NootropX - 90 caps - Mental Focus and Concentration Supplement With Memory Enhancement For Extreme Clarity and Alertness - Instant Brain and Memory Power Boost From Patented AES® Absorption System - The Ultimate Brain Vitamins which is a little bit more geared towards the focus aspect I was looking for. After two weeks of taking both of those, I noticed that I was performing better at school and work, and I had the energy to do even more than I had hoped for. My work was coming out better, as I had been able to focus more. I definitely recommend this supplement to anyone who is looking for an energy boost, and even though it didn’t give me a boost in focus, it’s still a great product and since everyone’s body is different it may work for you!

These pills are great! I used to drink coffee all the time but can't anymore due to stomach issues. Tea does not do enough and soda is not as healthy. As such I looked into caffeine pills. This brand packs a good little punch that lasts all day and doesn't make me crash or feel jittery. I have an hour commute to work and an hour back and these pills keep me awake and focused. They are easy to swallow and no taste. Also, I find I am able to take more caffeine such as maybe espresso with this and still feel okay. I would recommend taking it before your morning shower to let it kick in. As another note, these pills do not cause me any GI issues like coffee does. Pros: easy to swallow, keeps me focused, no jitters or crash Cons: effect dissipates after constant use, sometimes causes anxiety (infrequent)

This is has made a huge difference in my daily life. Definitely has increased my energy without feeling shaky.. I would recommend this ; just be aware not to take it in afternoon. It will def affect your sleep; stop taking at least 5 hours before bed

You should know that this can have the reverse effect and make you sleepy. Took me a week to figure out why I could hardly.function after starting this supplement. No jittery feelings, but several naps. So a no-go for me.

Did not work for me. Made me tired, super irritable and everything was in a weird slow motion for several hours. I didn't get any caffeine feel whatsoever. It was the complete opposite. The item says it's returnable, but when I tried to return it it said it was ineligible for a return. What a waste of $20 bucks.

Excellent source of energy and calm. I don't tend to use it everyday or even at the full recommended usage. But I really think this nootropic stack has helped me considerably during some of the more busy or challenging times of my life.

Good product,, I like it

I've been taking this stuff for about 2 weeks as a booster to my usual (Nootropic) vitamins. The effects come after about 30 mins: I felt calm, but focused, regardless of what time it was. The effect was not profound, but definitely provided the caffeine without the jitters and come down. Only downside was that the effects went as quickly as they came; Even taking 2 at a time, the effects only lasted about 90 mins. Would recommend this as a quick surge of mental energy, but it's not a wonder-pill and won't do much without another stack.

If you take two of these it should be 200mg of caffeine which roughly equates to 2-3 expresso from starbucks. Whatever caffeine is in these has about the same effect on me as a couple of cups of green tea ( at max 90mg of caffeine between the two). This is obviously anecdotal but it suggests there either isn't 100mg of caffeine per pill or the caffeine is of a bad quality with very little bioavailability and for 18.99 i cannot recommend spending the money on it. For roughly £20 you can get 100 grams of matcha tea which'll make roughly 75 teas, will keep you more awake and be better for you.

Does what it says on the tin. Good, focused energy. Very useful for those days you need a boost to your productivity and be more on task!