gnc l-theanine 200mg gnc gnc l-theanine 200mg: promotes relaxation* gnc l-theanine 200mg is a dietary supplement that can help enhance relaxation. l-theanine is an amino acid derived from black, white and especially green tea leaves. just take one 200mg softgel capsule of gnc l-theanine 200mg daily to remain calm and relaxed.* brings relief from daily life* offers calming support for pms* helps promote a sense of relaxation to cope with stress from everyday overwork and fatigue* supports a restful, relaxed state* these statements have not been evaluated by the food & drug administration. this product is not intended to diagnose, treat, cure, or prevent any disease.