I'm not a big user of hot sauces, so I've had a tiny bottle of Tabasco in my cupboards for....well, I don't know how long. Let's just say a LONG time. I'll pull it out when I need it, shake it well, and toss in however many drops I need. (Again, remember I'm not a fan of fiery-hot things!)
Anyway, I've noticed that the sauce in the bottle is a much darker reddish-brown than when I first bought it - I thought it had brighter reddish tones when I purchased it those many years ago. Shaking it redistributes whatever oil or whatever is in there that separates, and I haven't noticed any discernable difference in its heat.
Does it lose its "oomph"?