It's best to toss the eggs in the garbage. There's residue in the eggs after worming, however slight it might be could cause a reaction if a person is sensitive to the product. Toss them for 14 days after the last dosing. A small price to pay for healthy hens.
Zyfend A like VermX are snake oil, a waste of money. Use real wormers; valbazen liquid cattle sheep wormer or safeguard liquid goat wormer.
Administer either product orally undiluted using a syringe without a needle. Dosage for either wormer is 1/2cc for standard size birds, 1/4cc for smaller...