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Worth noting that Coffiest (Soylent's latest drink product) contains both caffeine and L-theanine. Their ratio is questionable (150mg caffeine, 75mg L-theanine), but subjectively I have found it to be a great way to boost my productivity in the morning, and I've never noticed jitters or anxiety despite the (relatively) high dose of caffeine. I also prefer the taste to regular Soylent -- no "wet cereal" aftertaste, and you can add a bit of sugar or chocolate syrup if it's too bitter for you.

Or enjoy a cup of sencha or gyokuro which comes with caffeine and L-Theanine. It is a lovely combination indeed. :)

Cannot recommend this enough! Upton tea carries really a really good sencha called 'Japanese Super Sencha Kamakura' and their Gyokuro is brilliant too.

Never hurts to carry around a few 200mg L-Theanine capsules though.

I got some theanine from a a bulk sit because it was cheap, but probably has a low portion of L-theanine vs D-theanine... may need to look into fixing that since the effects don't seem to be as good as when I tried Suntheanine...