Table 1 Keywords forming the search strategy of the review utilised for the five databases
Area and search number | Search terms |
|---|---|
Subjective cognitive impairment (S1) | “subjective cognitive impairment” OR “SCI” OR “subjective cognitive complaint*” OR “SCC” OR “subjective memory complaint*” OR “SMC” OR “cognitive decline” OR “preclinical dementia” OR “preclinical Alzheimer*” OR “age associated cognitive decline” OR “age related cognitive decline” OR “age associated memory impairment” |
Older adults without subjective cognitive impairment (S2) | “healthy ageing” OR “healthy aging” OR “older adult*” |
Intervention (S3) | “herbal medicine” OR “Chinese medicine” OR “complementary medicine” OR “alternative medicine” OR “natural medicine” OR “vitamin* OR nutraceutical” OR “nutritional supplement” OR “Chinese herbal medicine” OR “traditional Chinese medicine” OR “ginkgo” OR “ginseng” OR “alpha-lipoic acid” OR “lipoic acid” OR “bacopa monnier*” OR “brahmi” |
(S4) | S1 OR S2 AND S3 |