Short answer

We found no documented interaction between Alpha-lipoic acid and L-theanine in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.

Alpha-lipoic acid

What it is: An antioxidant the body makes and uses to produce energy.

What the research says: It's used for diabetic nerve pain, and studies suggest it can improve insulin sensitivity.

Cautions

• It can cause nausea, vomiting and low blood sugar.
• Rare cases of a condition causing sudden low blood sugar have been reported.

Medicines to check

• Diabetes medicines: it can lower blood sugar further

In Holitro: Alpha Lipoic Acid (500 mg per capsule)

Source: Memorial Sloan Kettering Cancer Center, About Herbs: Alpha-Lipoic Acid (updated July 2026)

L-theanine

What it is: An amino acid found in green tea, taken for calm and sleep.

What the research says: Small studies suggest it may improve sleep; results for anxiety are mixed.

Cautions

• No side effects have been reported for the supplement.
• It may not be safe in pregnancy or while breastfeeding.

Medicines to check

• Sleep medicines and sedatives (such as lorazepam, diazepam or zolpidem): may add to drowsiness

In Holitro: Theanine 200mg (200 mg per capsule)

Source: Memorial Sloan Kettering Cancer Center, About Herbs: L-Theanine (updated July 2026)

Check with your doctor or pharmacist, especially if you take medication.

Check your stack — free

Educational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.