Composition comprising (−)-Δ

1. A liquid composition comprising:

(a) a tetrahydrocannabinol compound selected from Δ 8 tetrahydrocannabinol, (−)-Δ 9 -trans-tetrahydrocannabinol and side chain alkyl derivatives of either compound,

(b) a solvent selected from the group consisting of oils, C 1 -C 4 alcohols and combinations thereof, and

(c) an acid,

wherein the acid is added in an amount effective to improve the stability of the composition.

2. The composition according to claim 1 , wherein the compound is said derivative of Δ 8 -tetrahydrocannabinol or (−)-Δ 9 -trans-tetrahydrocannabinol and the derivative has a 1,1-dimethylheptyl side chain.

3. The composition according to claim 1 , wherein the solvent is selected from the group consisting of sesame oil, olive oil, canola oil and combinations thereof.

4. The composition according to claim 1 , wherein the solvent is selected from the group consisting of methanol, ethanol, propanol, iso-propanol, butanol and combinations thereof.

5. The composition according to claim 1 , wherein the solvent is sesame oil.

6. The composition according to claim 1 , wherein solvent is ethanol.

7. The composition according to claim 1 , wherein the solvent is a combination of an oil and a C 1 -C 4 alcohol.

8. The composition according to claim 1 , wherein the acid is chosen from the group consisting of citric acid, oxalic acid, succinic acid, tartaric acid and lactic acid.

9. The composition according to claim 1 , wherein the acid is citric acid.

10. The composition according to claim 1 , wherein the acid is a weak acid.

11. The composition according to claim 1 , wherein the acid is a mineral acid.

12. The composition according to claim 11 , wherein the mineral acid is phosphoric acid.

13. The composition according to claim 1 , wherein the amount of acid is from 0.01-2% as a weight percentage of the composition.

14. The composition according to claim 1 , wherein the tetrahydrocannabinol compound comprises (−)-Δ 9 -trans-tetrahydrocannabinol and the amount of (−)-Δ 9 -trans-tetrahydrocannabinol in the composition is from 0.1-15% as a weight percentage of the composition.

15. The composition according to claim 1 , further comprising at least one of antimicrobial agents, preservatives and antioxidants.

16. A liquid composition comprising: a tetrahydrocannabinol compound selected from Δ 8 -tetrahydrocannabinol, (−)-Δ 9 -trans-tetrahydrocannabinol and side chain alkyl derivatives of either compound; a solvent selected from the group consisting of oils, C 1 -C 4 alcohols and combinations thereof; and an acid selected from the group consisting of citric acid, ascorbic acid, acetic acid, malic acid, oxalic acid, succinic acid, fumaric acid, salicylic acid, tartaric acid, phosphoric acid, hydrochloric acid, nitric acid, carbonic acid, and sulphuric acid, wherein the acid is added in an amount effective to improve the stability of the composition.

17. The composition according to claim 16 , wherein the compound is (−)-Δ 9 -trans-tetrahydrocannabinol, the solvent is a combination of sesame oil and ethanol, and the acid is citric acid or phosphoric acid.

18. The composition according to claim 1 , wherein:

the tetrahydrocannabinol compound comprises (−)-Δ 9 -trans-tetrahydrocannabinol, the solvent comprises sesame oil, and the acid is citric acid,

wherein the composition comprises ≦4.16% cannabinol after up to 3 months at (i) 5° C., (ii) 25° C./60% relative humidity, or (iii) 40° C./75% relative humidity.

19. The composition according to claim 1 , wherein:

the tetrahydrocannabinol compound comprises (−)-Δ 9 -trans-tetrahydrocannabinol, the solvent comprises ethanol, and the acid is citric acid, wherein the composition comprises ≦0.69% cannabinol after up to 1 month at 40° C.

20. A liquid composition consisting essentially of:

a) a tetrahydrocannabinol compound selected from Δ 8 -tetrahydrocannabinol, (−)-Δ 9 -trans-tetrahydrocannabinol and side chain alkyl derivatives of either compound,

b) a solvent selected from the group consisting of oils, C 1 -C 4 alcohols and combinations thereof, and

c) an acid selected from the group consisting of citric acid, ascorbic acid, malic acid, carbonic acid, and fumaric acid,

and, optionally, one or more anti-oxidants, antimicrobial agents, preservatives or a combination thereof,

wherein the acid is added in an amount effective to improve the stability of the composition.

21. The composition according to claim 7 , wherein the oil comprises sesame oil and the C 1 -C 4 alcohol comprises ethanol, and the acid comprises citric acid.

22. The composition according to claim 20 , wherein the solvent is a combination of sesame oil and ethanol, and the acid is citric acid.

23. The composition according to claim 16 , wherein the acid is selected from the group consisting of citric acid, oxalic acid, succinic acid, tartaric acid, acetic acid, lactic acid, salicylic acid, carbonic acid and mineral acids.

24. The composition according to claim 16 , wherein the tetrahydrocannabinol compound comprises (−)-Δ 9 -trans-tetrahydrocannabinol, the solvent comprises ethanol, and the acid is selected from the group consisting of citric acid and carbonic acid.

25. The composition according to claim 20 , wherein the tetrahydrocannabinol compound is (−)-Δ 9 -trans-tetrahydrocannabinol, the solvent is ethanol, and the acid is selected from the group consisting of citric acid and carbonic acid.

26. The composition according to claim 1 , wherein the acid is an organic acid.

27. The composition according to claim 26 , wherein the organic acid is selected from the group consisting of citric acid, ascorbic acid, malic acid, oxalic acid, succinic acid, and tartaric acid.

28. The composition according to claim 1 , wherein the solvent comprises unrefined sesame oil.

29. The composition according to claim 28 , wherein the acid is added as a separate component to at least one of the tetrahydrocannabinol compound and the solvent.

30. The composition according to claim 28 , wherein the acid is formed in at least one of the tetrahydrocannabinol compound and the solvent.