OKAY now I'm done I think.

code/modules/reagents/chemistry/recipes/medicine.dm

@@ -82,16 +82,16 @@
 	OptimalpHMax 		= 9.5 		// Higest value for above
 	ReactpHLim 			= 2 		// How far out pH wil react, giving impurity place (Exponential phase)
 	CatalystFact 		= 0 		// How much the catalyst affects the reaction (0 = no catalyst)
-	CurveSharpT 		= 2.5 		// How sharp the temperature exponential curve is (to the power of value)
+	CurveSharpT 		= 1 		// How sharp the temperature exponential curve is (to the power of value)
 	CurveSharppH 		= 2.5 		// How sharp the pH exponential curve is (to the power of value)
 	ThermicConstant		= 0.01 		// Temperature change per 1u produced
 	HIonRelease 		= 0.01 		// pH change per 1u reaction (inverse for some reason)
-	RateUpLim 			= 0.02 		// Optimal/max rate possible if all conditions are perfect
+	RateUpLim 			= 0.05 		// Optimal/max rate possible if all conditions are perfect
 	FermiChem 			= TRUE		// If the chemical uses the Fermichem reaction mechanics
 	PurityMin 			= 0
 
 /datum/chemical_reaction/synthtissue/FermiCreate(datum/reagents/holder, added_volume, added_purity)
-	var/datum/reagent/St = holder.has_reagent("synthtissue")
+	var/datum/reagent/synthtissue/St = holder.has_reagent("synthtissue")
 	var/datum/reagent/N = holder.has_reagent("nutriment")
 	if(!St)
 		return
@@ -102,6 +102,8 @@
 		St.volume *= St.purity
 		St.purity = 1
 	N.volume -= 0.002
+	St.grown_volume += added_volume
+	St.data = St.grown_volume
 
 /datum/chemical_reaction/styptic_powder
 	name = "Styptic Powder"

code/modules/surgery/graft_synthtissue.dm

@@ -5,7 +5,7 @@
 /datum/surgery/graft_synthtissue
 	name = "Graft_synthtissue"
 	species = list(/mob/living/carbon/human, /mob/living/carbon/monkey)
-	possible_locs = list(BODY_ZONE_CHEST)
+	possible_locs = list(BODY_ZONE_CHEST, BODY_ZONE_PRECISE_GROIN, BODY_ZONE_PRECISE_EYES)
 	steps = list(
 	/datum/surgery_step/incise,
 	/datum/surgery_step/retract_skin,

code/modules/surgery/organs/organ_internal.dm

@@ -198,7 +198,7 @@
 /mob/living/proc/regenerate_organs()
 	return 0
 
-/mob/living/carbon/regenerate_organs()
+/mob/living/carbon/regenerate_organs(only_one = FALSE)
 	var/breathes = TRUE
 	var/blooded = TRUE
 	if(dna && dna.species)
@@ -217,6 +217,8 @@
 			else
 				LI = new()
 			LI.Insert(src)
+			if(only_one)
+				return
 
 		if(has_stomach && !getorganslot(ORGAN_SLOT_STOMACH))
 			var/obj/item/organ/stomach/S
@@ -226,14 +228,20 @@
 			else
 				S = new()
 			S.Insert(src)
+			if(only_one)
+				return
 
 	if(breathes && !getorganslot(ORGAN_SLOT_LUNGS))
 		var/obj/item/organ/lungs/L = new()
 		L.Insert(src)
+		if(only_one)
+			return
 
 	if(blooded && !getorganslot(ORGAN_SLOT_HEART))
 		var/obj/item/organ/heart/H = new()
 		H.Insert(src)
+		if(only_one)
+			return
 
 	if(!getorganslot(ORGAN_SLOT_TONGUE))
 		var/obj/item/organ/tongue/T
@@ -245,7 +253,10 @@
 
 		// if they have no mutant tongues, give them a regular one
 		T.Insert(src)
-	else
+		if(only_one)
+			return
+
+	else if (!only_one)
 		var/obj/item/organ/tongue/oT = getorganslot(ORGAN_SLOT_TONGUE)
 		if(oT.name == "fluffy tongue")
 			var/obj/item/organ/tongue/T
@@ -266,6 +277,8 @@
 		else
 			E = new()
 		E.Insert(src)
+		if(only_one)
+			return
 
 	if(!getorganslot(ORGAN_SLOT_EARS))
 		var/obj/item/organ/ears/ears
@@ -275,9 +288,13 @@
 			ears = new
 
 		ears.Insert(src)
+		if(only_one)
+			return
 
 	if(!getorganslot(ORGAN_SLOT_TAIL))
 		var/obj/item/organ/tail/tail
 		if(dna && dna.species && dna.species.mutanttail)
 			tail = new dna.species.mutanttail
 			tail.Insert(src)
+			if(only_one)
+				return

modular_citadel/code/modules/reagents/chemistry/reagents/healing.dm

@@ -100,18 +100,38 @@
 	id = "synthtissue"
 	description = "Synthetic tissue used for grafting onto damaged organs during surgery, or for treating limb damage."
 	pH = 7.6
+	var/grown_volume = 0
+	var/injected_vol = 0
 
 /datum/reagent/synthtissue/reaction_mob(mob/living/M, method=TOUCH, reac_volume,show_message = 1)
+	cached_method = method
 	if(iscarbon(M))
 		var/target = M.zone_selected
 		if (M.stat == DEAD)
 			show_message = 0
 		if(method in list(PATCH, TOUCH))
-			M.apply_damage(volume*1.25, BRUTE, target)
-			M.apply_damage(volume*1.25, BURN, target)
+			M.apply_damage(reac_volume*-1.25, BRUTE, target)
+			M.apply_damage(reac_volume*-1.25, BURN, target)
 			if(show_message)
-				to_chat(M, "<span class='danger'>You feel your damaged [target] heal! It stings like hell!</span>")
+				to_chat(M, "<span class='danger'>You feel your [target] heal! It stings like hell!</span>")
 			SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "painful_medicine", /datum/mood_event/painful_medicine)
+	if(method == INJECT)
+		injected_vol += reac_volume
+	..()
+
+/datum/reagent/synthtissue/on_mob_life(mob/living/carbon/C)
+	if(!iscarbon(C))
+		return ..()
+	if(cached_method == INJECT)
+		if(grown_volume > 150) //I don't think this is even possible, but damn to I want to see if someone can (bare in mind it takes 2s to grow 0.05u)
+			if(volume >= 20)
+				C.regenerate_organs(only_one = TRUE)
+				C.reagents.remove_reagent(id, 20)
+	..()
+
+/datum/reagent/synthtissue/on_merge(data)
+	if(data > grown_volume)
+		grown_volume = data
 	..()
 
 //NEEDS ON_MOB_DEAD()

modular_citadel/code/modules/reagents/chemistry/recipes/fermi.dm

@@ -2,7 +2,7 @@
 	mix_sound = 'sound/effects/bubbles.ogg'
 
 //Called for every reaction step
-/datum/chemical_reaction/proc/FermiCreate(datum/reagents)
+/datum/chemical_reaction/proc/FermiCreate(datum/reagents/holder, added_volume, added_purity)
 	return
 
 //Called when reaction STOP_PROCESSING