Can I take supplements: hair, skin, nails (3, 000 mcg) and amino acids safely together to aid my hair and nails? I have a diet low in meat.

Yes. There are many good non-meat sources of Amino Acids including dairy, eggs, beans, nuts ; seeds but if you are concerned you are deficient in Amino Acids it is certainly safe to take them in supplement form. There is no reason you can't take Amino Acids and vitamins/minerals together.