diff --git a/barker/barker/routers/product.py b/barker/barker/routers/product.py
index 5fbae44..7d04923 100644
--- a/barker/barker/routers/product.py
+++ b/barker/barker/routers/product.py
@@ -6,13 +6,16 @@ from typing import List
 import barker.schemas.product as schemas
 
 from fastapi import APIRouter, Depends, HTTPException, Security, status
-from sqlalchemy import and_, or_, select, update
+from sqlalchemy import and_, insert, or_, select, update
 from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.orm import Session, contains_eager, joinedload
+from sqlalchemy.sql.functions import count
 
 from ..core.security import get_current_active_user as get_user
 from ..db.session import SessionFuture
 from ..models.menu_category import MenuCategory
+from ..models.modifier_categories_products import modifier_categories_products
+from ..models.modifier_category import ModifierCategory
 from ..models.product import Product
 from ..models.product_version import ProductVersion
 from ..models.sale_category import SaleCategory
@@ -88,6 +91,7 @@ def save(
                 valid_till=None,
             )
             db.add(product_version)
+            add_modifiers(item.id, product_version.menu_category_id, date_, db)
             db.commit()
             return product_info(product_version)
     except SQLAlchemyError as e:
@@ -97,6 +101,48 @@ def save(
         )
 
 
+def add_modifiers(product_id: uuid.UUID, menu_category_id: uuid.UUID, date_: date, db: Session):
+    products_in_category = db.execute(
+        select(count(ProductVersion.id)).where(
+            and_(
+                ProductVersion.menu_category_id == menu_category_id,
+                ProductVersion.product_id != product_id,
+                or_(
+                    ProductVersion.valid_from == None,  # noqa: E711
+                    ProductVersion.valid_from <= date_,
+                ),
+                or_(
+                    ProductVersion.valid_till == None,  # noqa: E711
+                    ProductVersion.valid_till >= date_,
+                ),
+            )
+        )
+    ).scalar()
+    categories = db.execute(
+        select(count(ProductVersion.id), ModifierCategory.id)
+        .join(Product.versions)
+        .join(modifier_categories_products, ProductVersion.id == modifier_categories_products.c.product_id)
+        .join(ModifierCategory, ModifierCategory.id == modifier_categories_products.c.modifier_category_id)
+        .where(
+            and_(
+                ProductVersion.menu_category_id == menu_category_id,
+                or_(
+                    ProductVersion.valid_from == None,  # noqa: E711
+                    ProductVersion.valid_from <= date_,
+                ),
+                or_(
+                    ProductVersion.valid_till == None,  # noqa: E711
+                    ProductVersion.valid_till >= date_,
+                ),
+            )
+        )
+        .group_by(ModifierCategory.id)
+    ).all()
+    for c, mc in categories:
+        if c == products_in_category:
+            db.execute(insert(modifier_categories_products).values(product_id=product_id, modifier_category_id=mc))
+
+
 @router.put("/{id_}", response_model=schemas.Product)
 def update_route(
     id_: uuid.UUID,