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In The Name of Allah (SWT)
Thanks for your e-mail. Regarding your question:
Generally, the man should use from all the blessings created and also considered Halal by the Almighty Allah. By the way, there is not Islamically and religiously no problem if someone doesn't use from Halal things unless it would be harmful if s/he doesn't use them; and if so, it is obligatory to use the things, for example meat as mentioned in your e-mail, to conserve one's health.
Office of Grand Ayatollah Saanei
Sayyid Khamenei, via leader.ir(no Arabic reply was included):
The answer is as follows:
By itself, it is no problem.
With prayers for your success,
Sayyid Sistani, via al-sistani.org(no Arabic included):
There is no problem in abstaining from eating meat or using such products.
I have not received anything from Sayyid Fadlullah as yet.
I posted the inquiry I sent earlier, if you want me to post that again let me know.