Partaking Panchagavyam is not based on scientific reasons. There are two aspects to partaking Panchagavyam. One, it cleanses the body. That is, the scriptures mention a few items related to cows, grant us strength, and this results in the cleansing of the body. The second aspect is nishkruti-prayaschittam – this is an atonement that we must not repeat the same mistake.
Generally, in material life, Panchagavyam is one that many hate and refrain from partaking it. But this is an atonement. If we commit an offense, we must undergo the requisite punishment. From this perspective, we must consider this an atonement. The chief aspect is that it cleanses the physical body. And it is an atonement for not repeating the same mistake.