A study of Abalone Haemocyanin for cold sores

INTERVENTION: Abalone Haemocyanin (AH) 50mg applied topically once daily for 5 days within 6 hours of profromal symptom. CONDITION: Herpes Labialis (cold sores) PRIMARY OUTCOME: The primary objective is to evaluate the duration of cold sore episodes in subjects treated with AH as compared with placebo. SECONDARY OUTCOME: To evaluate the efficacy of AH in preventing or blocking cold sore lesion development. This will be assessed by a subject diary recording of progression and duration of cold sore development. Also by Investigator clinical assessment. To evaluate the safety and tolerability of topical AH 50mg administered once daily for 5 days. This will be assessed by recording of adverse events, laboratory tests (haematology, biochemistry and urinalysis) and other clinical assessments (physical exam, vital signs and ECG). INCLUSION CRITERIA: Male or female with history of recurrent cold sores and have experienced at least three episodes in the previous 12 months.