Curious as to the amount of Caffeine and L-Theanine in each capsule, could you provide a rough estimate of each please?

100 mg Caffeine and 200 mg L-Theanine per capsule.

Hi Amazon Customer, Thank you for your question. Smart Caffeine is dairy free. We hope this helps! If you have any other questions or concerns, please let us know by reaching out to us directly -- contact@thegroupdeal.com. -Zoey, Customer Service Customer satisfaction is our top priority. We are always happy to help!

I am considering these, but at a lower dose. Are these pills solid that can be broken in half or are they capsules filled with powder?

Check out my response to Luis's comment, but obviously it's you're body so you can do whatever you want. There are other brands on Amazon that sell this same stack but at different doses. Here ya go: http://smile.amazon.com/Puritans-Pride-Caffeine-L-Theanine-Capsules/dp/B00NAWBUHC/ref=pd_sbs_hpc_4?ie=UTF8&refRID=0YMTY1N1XRT72QW09TVVThose have exactly half of what Smart Caffeine has.

How long do the feeling of concentration last from 1 dose?

Let's use today, this morning I took a pill at 9:30. I didn't redose on caffeine (coffee) till 3:55. I would say I felt the slowdown at around 3pm. So it is pretty textbook 5-ish hours that caffeine is rated for. The difference with this pill is besides the non jittery high, the comedown is very easy and didn't feel like a crash, and that's even after a couple of meals.

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Smart Caffeine 100mg With L-Theanine 200mg, Energy And Focus, 60 Capsules | Balanced pairing for smooth alertness with no jitters and no crash. Ideal before work, study, or the gym.

Product ID: 1549744

Details

Age Range (Description)
Adult
Brand
NATURAL STACKS
Diet Type
Gluten Free
Flavor
Unflavored
Item Form
Capsule
Item dimensions L x W x H
3.94 x 3.94 x

⚡100mg pure caffeine for clean energy

🌿200mg L-Theanine for calm focus

🚫No jitters or caffeine crash

$41.60

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Description

⚡ Elevate your focus, ditch the crash — smart energy for the modern pro!

VERSATILE DAILY USE - Perfect for mornings, study sessions, or pre-workout energy—ditch your coffee jitters and stay sharp all day.
BALANCED ENERGY BOOST - 100mg caffeine + 200mg L-Theanine delivers smooth, sustained alertness without the usual caffeine crash.
CALM FOCUSED MINDSET - L-Theanine from green tea promotes relaxation, eliminating jitters and anxiety common with typical caffeine pills.
TRUSTED OPEN SOURCE BRAND - Natural Stacks’ commitment to transparency means you know exactly what you’re putting in your body.
CLEAN TRANSPARENT FORMULA - Non-GMO, gluten-free, vegan ingredients with full traceability and 3rd party lab testing for peace of mind.

NATURAL STACKS Smart Caffeine Pills combine 100mg of pure caffeine with 200mg of L-Theanine to provide a jitter-free, sustained energy boost. Designed for adults seeking enhanced focus and productivity, this vegan, gluten-free supplement supports calm alertness without the typical caffeine crash. Backed by transparent sourcing and third-party testing, it’s a clean, reliable alternative to coffee and energy drinks.

Specifications

ASIN	B00GXPNEUO
Age Range Description	Adult
Allergen Information	Gluten Free
Best Sellers Rank	#64,084 in Health & Household ( See Top 100 in Health & Household ) #287 in Sports Nutrition Endurance & Energy Supplements #18,080 in Vitamins, Minerals & Supplements
Brand	NATURAL STACKS
Brand Name	NATURAL STACKS
Color	Blue
Container Type	Bottle
Customer Reviews	4.3 out of 5 stars 619 Reviews
Diet Type	Gluten Free
Dosage Form	1 Capsule
Flavor	Unflavored
Item Dimensions	3.94 x 3.94 x 3.94 inches
Item Form	Capsule
Item dimensions L x W x H	3.94 x 3.94 x 3.94 inches
Manufacturer	Natural Stacks
Manufacturer Part Number	PB-Q91J-HSEU
Material Features	Vegan
Number of Items	1
Primary Supplement Type	Caffeine
Product Benefits	Focused Energy
Special Ingredients	Caffeine, L-Theanine
Specific Uses For Product	Energy, Focus
UPC	798295452535
Unit Count	60 Count

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Suresh K.

Very impressed with the quality and fast delivery. Will shop here again.

4 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

$41.60

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews