hi welcome to hcm.see apple cider vinegar main effect it detoxify the body and with honey help in weight loss
also in bp .main side effect of it if u take directly:1)weaken the tooth enamle
2)damage throat and skin
3)lower blood potassium and bone density
4)heart burn and gastric upset
so don't be worry it not lower ur hb .if ur hb low then eat green leafy vegies specially all bhajies,baigan,pea nut and also take any iron supplement.if ur hb is 15 then no need to worry.