in 10 offers
The lowest price for Source Naturals Serene Science L-Theanine right now is $11.33 at Professional Supplement Center, compared across 5 retailers.
The all-time low was $11.33 on 6 June 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 6 June 2026.
Source Naturals Serene Science L-Theanine
Last updated at 06/06/2026 02:18:27
L-Theanine Powder, by Source Naturals, .7 Oz
Delivery $12.76
Serene Science L-Theanine 200 Mg Tablets, by Source Naturals, 30 Tablets
Delivery $12.76
Serene Science L-Theanine 200 Mg, by Source Naturals, 120 Capsules
Delivery $12.76
L-Theanine 200 mg, 30 caps
Delivery $35.09
Source Naturals, Serene Science , L-Theanine, 60 Tablets
Delivery $40
Source Naturals, L-Theanine, 200 mg, 120 Capsules
Delivery $40
Source Naturals L-Theanine 200 mg 60 Tablets
Delivery between 8–19 June $28.34
Source Naturals, Serene Science , L-Theanine, 60 Tablets
14-day returns
Source Naturals, Serene Science , L-Theanine, 200 mg, 60 Capsules
Delivery $9.99
Source Naturals, L-Theanine, 200 mg, 120 Capsules
Delivery $9.99
L-Theanine Powder, by Source Naturals, .7 Oz
Delivery $12.76
Serene Science L-Theanine 200 Mg Tablets, by Source Naturals, 30 Tablets
Delivery $12.76
Serene Science L-Theanine 200 Mg, by Source Naturals, 120 Capsules
Delivery $12.76
L-Theanine 200 mg, 30 caps
Delivery $35.09
Source Naturals, Serene Science , L-Theanine, 60 Tablets
Delivery $40
