diff --git a/app.py b/app.py
index 41cd39d..f207c90 100644
--- a/app.py
+++ b/app.py
@@ -1952,7 +1952,7 @@ def suggest_products():
 @app.route("/all_products")
 def all_products():
     sort = request.args.get("sort", "popularity")
-    limit = request.args.get("limit", type=int) or 100
+    limit = request.args.get("limit", type=int) or 50
     offset = request.args.get("offset", type=int) or 0
 
     rows = db.session.query(Item.name, Item.list_id).distinct().all()
diff --git a/static/js/mass_add.js b/static/js/mass_add.js
index 89b2f01..f8e29ac 100644
--- a/static/js/mass_add.js
+++ b/static/js/mass_add.js
@@ -6,13 +6,7 @@ document.addEventListener('DOMContentLoaded', function () {
   const modalBody = modal?.querySelector('.modal-body');
 
   function normalize(str) {
-    return str
-      ? str.normalize("NFD")
-        .replace(/[\u0300-\u036f]/g, "")
-        .replace(/\s+/g, ' ')
-        .trim()
-        .toLowerCase()
-      : '';
+    return str?.trim().toLowerCase() || '';
   }
 
   let sortMode = 'popularity';
@@ -69,7 +63,7 @@ document.addEventListener('DOMContentLoaded', function () {
     try {
       const res = await fetch(`/all_products?sort=${sortMode}&limit=${limit}&offset=${offset}`);
       const data = await res.json();
-      const products = data.products || data.allproducts || [];
+      const products = data.products || [];
 
       if (products.length < limit) reachedEnd = true;
       allProducts = reset ? products : allProducts.concat(products);
@@ -114,12 +108,23 @@ document.addEventListener('DOMContentLoaded', function () {
 
   function renderProducts(products) {
     addedProducts = getAlreadyAddedProducts();
-    products.forEach(name => {
-      if (typeof name === "object" && name.name) name = name.name;
+
+    const existingNames = new Set();
+    document.querySelectorAll('#mass-add-list li').forEach(li => {
+      const name = li.querySelector('span')?.textContent;
+      if (name) existingNames.add(normalize(name));
+    });
+
+    products.forEach(product => {
+      const name = typeof product === "object" ? product.name : product;
+      const normName = normalize(name);
+      if (existingNames.has(normName)) return;
+      existingNames.add(normName);
+
       const li = document.createElement('li');
       li.className = 'list-group-item d-flex justify-content-between align-items-center bg-dark text-light';
 
-      if (addedProducts.has(normalize(name))) {
+      if (addedProducts.has(normName)) {
         const nameSpan = document.createElement('span');
         nameSpan.textContent = name;
         li.appendChild(nameSpan);