Theanine supplements with the fewest additives

I've been experimenting with theanine for its possible anti-anxiety and pro-sleep effects. When purchasing supplements like theanine, I try to avoid as many excipients as possible and prefer brands that can provide certificates of analysis. If you'd like to do the same, here's the brands I compared.

Theanine powder suggestions:

I use theanine in powder form. Powder makes it easy to adjust the dosage, and the taste is inoffensive (it reminds me of a mild powdered sugar). I'd suggest any of the following, they all are straight theanine powder with COA's available:

Name Ingredients
BulkSupplements Theanine (Powder)
Available on Bulk Supplements

L-theanine.

A BulkSupplements certificate of analysis is available. The country of origin is China.

PureBulk Theanine (Powder)
Available on PureBulk

L-theanine.

A PureBulk certificate of analysis is available. The country of origin is China.

Theanine gelatin capsule suggestions:

Name Ingredients
BulkSupplements Theanine (Gelatin Capsules)
Available on Bulk Supplements

L-theanine (500mg), gelatin (capsule).

A BulkSupplements certificate of analysis is available. The country of origin is China.

PureBulk Theanine (Gelatin Capsules)
Available on PureBulk

L-theanine (500mg), gelatin (capsule, bovine source).

A PureBulk certificate of analysis is available. The country of origin is China.

Theanine veggie capsule suggestions:

Name Ingredients
BulkSupplements Theanine (Veggie Capsules)
Available on Bulk Supplements

L-theanine (500mg), cellulose (capsule, probably hydroxypropyl methylcellulose).

A BulkSupplements certificate of analysis is available. The country of origin is China.

PureBulk Theanine (Veggie Capsules)
Available on PureBulk

L-theanine (500mg), cellulose (capsule, probably hydroxypropyl methylcellulose).

A PureBulk certificate of analysis is available. The country of origin is China.

In the UK?

Bulk Powders has a straight theanine powder with a certificate of analysis available.


Other theanine products

The following are other theanine products I compared, sorted alphabetically. I'm not necessarily recommending against most of these, they just generally have unnecessary ingredients or are unlikely to provide certificates of analysis.

Name Ingredients
Advance Physician Formulas L-Theanine (Gelatin Capsules)

L-theanine, rice flour, gelatin (porcine).

Country Life L-Theanine (Veggie Capsules)

Vitamin B6, Suntheanine l-theanine, cellulose (capsule shell, probably hydroxypropyl methylcellulose), cellulose, magnesium stearate, silica.

Doctor's Best Suntheanine L-Theanine (Veggie Capsules)

L-theanine, microcrystalline cellulose, modified cellulose (vegetarian capsule, probably hydroxypropyl methylcellulose).

Enzymatic Therapy L-Theanine (Veggie Capsules)

L-theanine (Suntheanine brand), cellulose, vegetable capsule (modified cellulose), and magnesium stearate.

Jarrow Formulas Theanine 100/200 (Gelatin Capsules)

L-theanine, cellulose, magnesium stearate (vegetable source) and silicon dioxide. Capsule consists of gelatin.

Life Extension L-Theanine (Veggie Capsules)

L-theanine (Suntheanine), Microcrystalline cellulose, vegetable cellulose (capsule, probably hydroxypropyl methylcellulose), ascorbyl palmitate.

Natural Factors Stress-Relax L-Theanine (Chewable Tablets)

L-theanine, organic cane sugar, xylitol, stearic acid, silica, natural fruit flavor (banana, pomegranate, pineapple, mango, passion fruit, citric acid, magnesium stearate (vegetable grade).

Now Foods L-Theanine (Chewable Tablets)

L-theanine, inositol, taurine (free-form), Xylitol, cellulose, sorbitol, stearic acid (vegetable source), natural flavors, silica, malic acid, betterstevia [organic stevia extract (leaf)], magnesium stearate (vegetable source) and beet powder.

Now Foods L-Theanine (Veggie Capsules)

L-theanine, decaffeinated green tea (Camellia sinensis) (leaf), cellulose (capsule, probably hydroxypropyl methylcellulose), rice flour, magnesium stearate (vegetable source) and silica.

NutraBio L-Theanine (Powder)

L-theanine, maltodextrin, gelatin.

I suspect NutraBio's product is high-quality, but they are unable to provide me COAs without purchasing.

NutraBio L-Theanine (Veggie Capsules)

L-theanine, vegetable capsule (probably hydroxypropyl methylcellulose).

NutraLife L-Theanine (Veggie Capsules)

L-theanine, vegetarian capsule (hypromellose), cellulose, silica, magnesium stearate.

Paradise Herbs Optimized Sun Theanine (Veggie Capsules)

L-theanine (Sun Theanine), OptiMSM (methylsulfonylmethane), capsule (plant cellulose, probably hydroxypropyl methylcellulose).

Powder City Theanine (Gelatin Capsules) [now out of business]

L-theanine, maltodextrin, gelatin.

A third-party certificate of analysis is available.

Powder City Theanine (Powder) [now out of business]

L-theanine.

A third-party certificate of analysis is available.

Pure Encapsulations L-Theanine (Veggie Capsules)

L-theanine, hypoallergenic plant fiber (cellulose), vegetarian capsule (probably hydroxypropyl methylcellulose).

Source Naturals L-Theanine (Gelatin Capsules)

L-theanine, microcrystalline cellulose, gelatin (capsule), colloidal silicon dioxide and magnesium stearate.

Thorne Research Theanine (Veggie Capsules)

L-theanine, hypromellose (derived from cellulose) capsule, microcrystalline cellulose, leucine, silicon dioxide.


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