“Helium 4” is normal helium.
Yup.
Helium-4 (also written 4 He) is an isotope of helium. It is the most common isotope of helium in the universe. Out of all the helium on the Earth, 99.99986% is helium-4.
Helium 2 is dangerous to the environment and helium 1 is even worse!
I just check and per Dr. Fauci Helium 4 is safe and effective, so no worries!
So, if you're at Yellowstone and people start talking in 'Mickey Mouse' voices, it's time to RUN!
And worth a lot of money