Police in Ruislip are currently searching for two people suspected of being involved in the thefts from the chemist that happened on Thursday, December 1 and Tuesday, December 6.
The first incident happened at around 12.30pm on December 1 at the Boots store in Ruislip High Street.
This was followed by two offences on December 6 at around 3.25pm in Joel Street, Northwood and another in Ruislip High Street, 20 minutes later.
On each occasion they entered the store, walked directly to the cosmetics section and started filling bags with products before leaving the store and making no attempt to pay.
The Metropolitan Police has released images of two people who may be able to help with their investigation.
Anyone who recognises either of these people is asked to call Ruislip Police Station on 101 and ask for PC Targoni.
Information can be passed to crimestoppers anonymously on 0800555111.
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