You gave me fairly panic with that nail lines constant and I just had to go look it up.

No, nails having lines going down them is not necessarily a sign of vitamin deficiency. Turns out that the majority of the time it's completely harmless and a sign of aging. Both index fingers and my right middle finger have a very faint dark line going from cuticle tip.

Your mileage may vary, IDK about your personal diet etc. just wanted to chime in about the nails thing