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Not really. If you're ingesting it you'd want it to be tested safe for human consumption and clear of nasty performance enhancers, particularly, as a pro cyclist. Not the stuff that is used to make fridges smell nice or clean stuff. I guess you could buy the cooking stuff but maybe there's an issue with contamination or maybe he just had a standing order for picking up all his stuff from the pharmacy?
Using bicarb is totally legit. Especially in hot environments.
Is it unethical to train? Is it unethical to eat better than someone else? I presume you've never ingested caffeine?