Source Naturals Guarana Energizer Caffiene and Energy* – 900 mg,100 Tablets | ⭐ Flexiology.Store Recommended
Original price was: $19.75.$13.83Current price is: $13.83.
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Price: $19.75 - $13.83
(as of Oct 03, 2025 07:06:12 UTC – Details)
From the brand
Source Naturals
Unlocking Wellness, Transforming Lives
High Demand Products
Source Naturals’ comprehensive Bio-Aligned Formulas® help bring the power of alignment to your body. When formulating, we evaluate the underlying causes of system imbalances, and then provide targeted nutrition to interdependent body systems. Our line of more than 600 products also includes well-researched, single-entity nutrients in their highest quality and most bioavailable forms.
New Arrivlas
How did we get our start?
Source Naturals® was founded in 1982 in Santa Cruz, California, by Ira Goldberg with the belief that the foundation for living your dream life is having vibrant health, and that taking individual responsibility for one’s health is the key.*
What makes our products unique?
The brand is renowned for its Bio-Aligned Formulas rooted in an integrative health philosophy.
What problem are we solving?
We have over 600 unique products spanning from immune, sleep, mood, and vision support to heart and brain health, and more.
Melatonin Supplements
Is Discontinued By Manufacturer : No
Product Dimensions : 2.37 x 2.37 x 4.33 inches; 0.37 ounces
Item model number : SN0232
Date First Available : April 21, 2004
Manufacturer : Threshold Enterprises
ASIN : B000RP9EOG
Best Sellers Rank: #43,315 in Health & Household (See Top 100 in Health & Household) #183 in Sports Nutrition Endurance & Energy Supplements #2,860 in Sales & Deals
Customer Reviews: 4.4 4.4 out of 5 stars 814 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Guarana is a natural herb imported from Brazil. It has been used for centuries by the Native Americans of the Amazon as an energizer.
Suggested Use: 1 tablet up to twice daily. If stomach upset occurs, take with food.
Well Made Supplement: Contains wheat.Suitable for vegetarians. Contains no yeast, dairy, egg, or soy. Contains no sugar, preservatives, or artificial color, flavor or fragrance.
Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health.
Manufactured in the USA. Manufactured in Scotts Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration. (FDA)
Customers say
Customers find the guarana supplement effective, providing constant energy throughout the day without making them jittery. The product receives positive feedback for its quality and value, with one customer noting it works well as a coffee replacement. While some customers report no side effects, others experience severe migraines from even half a dose. The supplement’s strength receives mixed reviews, with some finding it really strong while others say it’s too strong, and customers note the pills are rather large.
🌿 Expert Tip: Selected by our Flexiology Experts for quality & value.
⚠️ Disclaimer: Information is for educational purposes and not a substitute for medical advice. Consult your physician before use. Flexiology.Store is not responsible for any adverse effects.
10 reviews for Source Naturals Guarana Energizer Caffiene and Energy* – 900 mg,100 Tablets
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Richard L. –
Gives you that extra to stay alert
Take this instead of drinking sugary coke or coffee to stay alert. I use it when I driving long distances and need to stay awake. No side effects for me. Easy to swallow. I’m glad I have it.
Patrick Neary –
This can be the best for some people and potential trouble for others. BP warning:
It triggers my bipolar mania. Even though this detrimental effect is short-lived – only a few hours before coming back to normal… I don’t feel right taking this ever again in supplement form. It’s ok in a Monster Energy Drink or a Starbucks Tripleshot coffee or something for me personally. Really it’s in my opinion the best herbal supplement for energy that is somewhat adventurous and flexitive. For me more like go outside and play, climb pine trees or something. In contrast, I’ll suggest this term: “GNC-type herbal stimulants” – they feel more oriented toward focus and less towards locomotive behavior.
Mayra S. –
Approved by an Overnight Registered Nurse, Has worked great last 4 years!
I have worked overnight as a Registered Nurse for the last 4 of 6 years and I will offer my own experience on how these pills have helped me in my job performance. To start of with I have to say that no two human beings are the same so before I bought these pills I read the good and bad reviews and wasn’t sure on the product. I’ve had heart palpitations in the past from excess caffeine when I drank one of the blue pop top Rock Stars with 1.5 times the caffeine as regular Rock Star and I can say that no, it’s not fun at all. I’ve also experienced when I drink to much caffeine at once and find myself either visiting the restroom many times during a shift, or the crash that comes after the initial burst of energy. Anyways, I can say that with ONE pill a shift prior to going to work, I am able to stay awake and not in a forceful manner without the many negative effects from caffeine that I’ve experienced in the past. Working night shifts, I’ve seen how many co-workers need to chain drink coffee all night. I can’t say that I don’t like coffee, but I don’t drink it more than once a week and I prefer not too if I have the chance. This is why I am glad that the Guarana Energizer has worked for me. I am able to be more alert all shift long, not have to struggle with energy or struggle with staying awake, and when I get home I not too wired where I have a hard time going to sleep. On my days off it also works as an excellent energy booster for the mornings to get your energy level going for your day ahead. Also, I’ve tried other guarana pills when the Source Naturals were no longer in stock (same 900 mg strength), and I have to say that I had to take more than 2 pills per shift to keep me awake, plus they never lasted a full shift. Don’t know why the “energizer” term makes a difference, but it does for me. I recommend it to all my co-workers, and when they feel low on energy I’ve seen that even 1/2 a tab is sufficient for a little pick me up especially for those sensitive to caffeine.
Memory Ebeier Wortham –
Great substitute for Adderall.
This is a great supplement to have around, especially because it’s SO easy and economical compared to coffee. I would happily rate it 5 stars BUT I have to admit that the first few times I took it, the jitters it gave me were pretty extreme. It didn’t bother me AT ALL, but I know that it would be WAY too strong for a lot of people.However, if you’re not a stranger to over-loading yourself on caffeine (or other stimulants) and you generally like its effects, this should be a great supplement for you. Very importantly, the jitters went away by the 4th day I took it and now it’s hardly noticeable.I started using it so I could easily lower my daily dose of Adderall (prescribed for ADD) and it did the job well.
MacMoose –
The best guarana I’ve used – helped me kick energy drinks!
I suppose I ought to stand in front of a group of people, and admit to being a caffeine addict. However, I rather like caffeine. I started in on caffeine at an early age- first by drinking soda- mostly cola- as often as my parents would allow. As a teenager, I discovered coffee. Later, it was espresso drinks- I loved a good quad-shot latte, and eventually was getting several a day. A few years ago, my stomach stopped agreeing with coffee as much, so I switched to energy drinks. I was drinking about 4 Rockstars a day.After doing the math, I realized that I was spending around $300 a month on these silly beverages. To economize, I switched to No-Doz. However, it wasn’t the same, and it honestly felt… unnatural. The No-Doz sometimes aggravated my stomach, and I just didn’t feel as well. Then I tried Guarana, as it is one of the main functional ingredients in many energy drinks. Love it. It seems to last a bit longer (it could be my imagination there, I am unsure), and it definitely feels more natural. I take a few of these per day- and I seem to have less of a “caffeine crash” after 4 hours or so than I once did. It still happens, but it’s more gentle.My only complaint is that the pills are rather large- definitely a chore to swallow!Bottom line- this stuff costs just a bit more than a bottle of No-Doz, and is made from natural stuff. It feels healthier, and probably is. I now spend in a month wha I spent in a day on energy drinks. Also- for what it’s worth- I’ve tried other brands of guarana, and this one “feels” best.
Jim RAMBO Sr –
Good deal
Seems to work
はんじゃ –
だるい時、テンションが上がらない時、不安な時。ネガティブな感情の時など限定的に使ってます。
Works but be careful –
This definitely works but take with caution. I felt very wired and had panic attack symptoms.
Sherif Abdellatif –
I read a lot about Guarana benefits, but after I used this product for a month, it doesn’t do any effect at all !! even after taking double dose (4 tablets at morning) still nothing happens at all !! no good effect of any kind !! avoid and save your money.
Cliente de Amazon –
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