HCG pregnyl needles needed

can anyone tell me what are the needle gauge and size
needed for HCG? also how does one calculate dosage needed
let's say for example someone on 500mg of test cyopiate with some
primo 200mg for 1 month and a half. How much IU of HCG should be used after the cycle mentioned above? and for how long should it be used?

I read that taking too much could damage natural test production, would
500 IU be too much?
thanks

A 6 wk cycle doesn't need HCG, shelve it and use it for a cycle that lasts longer, say 12 weeks or more.

For me cypoinate does not even start to take effect until week 6. I'd never run cyp shorter than 12 weeks.

As shortie said hcg is not necessary for a 6 week cycle.

For hcg, I use a .5" slin pin and inject the hcg sub-q. Some inject intramuscular which would require a 1" needle.