  We compare two competing theories regarding finite temperature wave-function
corrections for the process $H \to e^+e^-$ and for $n+\nu \to p+e^-$ and
related processes of interest for primordial nucleosynthesis. Although the two
methods are distinct (as shown in $H \to e^+e^-$) they yield the same finite
temperature correction for all $n\to p$ and $p \to n$ processes. Both methods
yield an increase in the He/H ratio of .01% due to finite temperature
renormalization rather than a decrease of .16% as previously predicted.
