497. Is it OK to eat blood?

Yes, you must drink Jesus's blood to be saved.

Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. For my flesh is meat indeed, and my blood is drink indeed. He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him. John 6:53-56

No, it is absolutely forbidden by God

But flesh with the life thereof, which is the blood thereof, shall ye not eat. Genesis 9:4

It shall be a perpetual statute for your generations throughout all your dwellings, that ye eat neither fat nor blood. Leviticus 3:17

Ye shall eat no manner of blood, whether it be of fowl or of beast, in any of your dwellings. Whatsoever soul it be that eateth any manner of blood, even that soul shall be cut off from his people. Leviticus 7:26-27

And whatsoever man there be of the house of Israel, or of the strangers that sojourn among you, that eateth any manner of blood; I will even set my face against that soul that eateth blood, and will cut him off from among his people. ... No soul of you shall eat blood, neither shall any stranger that sojourneth among you eat blood. ... Ye shall eat the blood of no manner of flesh: for the life of all flesh is the blood thereof: whosoever eateth it shall be cut off. Leviticus 17:10-14

Ye shall not eat any thing with the blood. Leviticus 19:26

Ye shall not eat the blood; ye shall pour it upon the earth as water. Deuteronomy 12:16

Only be sure that thou eat not the blood. Deuteronomy 12:23

But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood. ... For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things; That ye abstain from meats offered to idols, and from blood. Acts 15:20, 28-29