diff --git a/code/__DEFINES/DNA.dm b/code/__DEFINES/DNA.dm
index 0c5d6121..9a066493 100644
--- a/code/__DEFINES/DNA.dm
+++ b/code/__DEFINES/DNA.dm
@@ -12,6 +12,7 @@
 #define MUTATE		/datum/mutation/human/bad_dna
 #define COUGH		/datum/mutation/human/cough
 #define DWARFISM	/datum/mutation/human/dwarfism
+#define GIANTISM	/datum/mutation/human/giantism
 #define CLOWNMUT	/datum/mutation/human/clumsy
 #define TOURETTES	/datum/mutation/human/tourettes
 #define DEAFMUT		/datum/mutation/human/deaf
@@ -151,4 +152,4 @@
 //used for the can_chromosome var on mutations
 #define CHROMOSOME_NEVER 0
 #define CHROMOSOME_NONE 1
-#define CHROMOSOME_USED 2 
\ No newline at end of file
+#define CHROMOSOME_USED 2 
diff --git a/code/datums/mutations/body.dm b/code/datums/mutations/body.dm
index a64f4afd..517c406c 100644
--- a/code/datums/mutations/body.dm
+++ b/code/datums/mutations/body.dm
@@ -68,7 +68,7 @@
 			owner.throw_at(target, cough_range, GET_MUTATION_POWER(src))
 
 
-//Dwarfism shrinks your body and lets you pass tables.
+//Dwarfism shrinks your body.
 /datum/mutation/human/dwarfism
 	name = "Dwarfism"
 	desc = "A mutation believed to be the cause of dwarfism."
@@ -80,17 +80,43 @@
 /datum/mutation/human/dwarfism/on_acquiring(mob/living/carbon/human/owner)
 	if(..())
 		return
-	owner.transform = owner.transform.Scale(1, 0.8)
-	owner.pass_flags |= PASSTABLE
+	if(owner.size_multiplier <= RESIZE_A_TINYMICRO) //Because what's optimization?
+		return
+	owner.resize(owner.size_multiplier-0.2)
 	owner.visible_message("<span class='danger'>[owner] suddenly shrinks!</span>", "<span class='notice'>Everything around you seems to grow..</span>")
 
 /datum/mutation/human/dwarfism/on_losing(mob/living/carbon/human/owner)
 	if(..())
 		return
-	owner.transform = owner.transform.Scale(1, 1.25)
-	owner.pass_flags &= ~PASSTABLE
+	if(owner.size_multiplier >= RESIZE_A_MACROHUGE)
+		return
+	owner.resize(owner.size_multiplier+0.2)
 	owner.visible_message("<span class='danger'>[owner] suddenly grows!</span>", "<span class='notice'>Everything around you seems to shrink..</span>")
 
+//Giantism grows your body.
+/datum/mutation/human/giantism
+	name = "Giantism"
+	desc = "A mutation believed to be the cause of giantism."
+	quality = POSITIVE
+	difficulty = 14
+	instability = 5
+	locked = TRUE
+
+/datum/mutation/human/giantism/on_acquiring(mob/living/carbon/human/owner)
+	if(..())
+		return
+	if(owner.size_multiplier >= RESIZE_A_MACROHUGE)
+		return
+	owner.resize(owner.size_multiplier+0.2)
+	owner.visible_message("<span class='danger'[owner] expands in size!</span>", "<span class='notice'>Everything around you compresses smaller...</span>")
+
+/datum/mutation/human/giantism/on_losing(mob/living/carbon/human/owner)
+	if(..())
+		return
+	if(owner.size_multiplier <= RESIZE_A_TINYMICRO)
+		return
+	owner.resize(owner.size_multiplier-0.2)
+	owner.visible_message("<span class='danger'>[owner] suddenly shrinks back down!", "<span class='notice'>You shrink back down in size.</span>")
 
 //Clumsiness has a very large amount of small drawbacks depending on item.
 /datum/mutation/human/clumsy
@@ -259,4 +285,4 @@
 		owner.jitteriness = min(max(0, owner.jitteriness + 5), 30)
 		if(prob(25))
 			to_chat(owner,"<span class='warning'>You feel someone creeping in on you...</span>")
-			owner.hallucination += 20
\ No newline at end of file
+			owner.hallucination += 20
diff --git a/code/game/objects/items/dna_injector.dm b/code/game/objects/items/dna_injector.dm
index 8849ac51..575cee78 100644
--- a/code/game/objects/items/dna_injector.dm
+++ b/code/game/objects/items/dna_injector.dm
@@ -140,6 +140,15 @@
 	desc = "It's a small world after all."
 	add_mutations = list(DWARFISM)
 
+/obj/item/dnainjector/antigiant
+	name = "\improper DNA injector (Anti-Giantism)"
+	desc = "Makes you small and weak."
+	remove_mutations = list(GIANTISM)
+
+/obj/item/dnainjector/giant
+	name = "\improper DNA injector (Giantism)"
+	desc = "Makes you bigger."
+
 /obj/item/dnainjector/clumsymut
 	name = "\improper DNA injector (Clumsy)"
 	desc = "Makes clown minions."