I notice a difference. Really bad toxins in my body sometimes come out my back in rashes or acne. It's an evolutionarily-grown mechanism to deal with something that Grok encountered, but I doubt he suffered from it to the same extent that we do now.
Make sure you're getting plenty of yogurt and other healthy probiotics to keep your system healthy.
You say you eat healthily- what are you eating? There could be something triggering it that you haven't made the connection. How long have you been eating PB?