diff --git a/src/Controller/ProductController.php b/src/Controller/ProductController.php
index 20ebb4b..ac259d3 100644
--- a/src/Controller/ProductController.php
+++ b/src/Controller/ProductController.php
@@ -23,12 +23,29 @@ final class ProductController extends BaseController
             'price' => fn($query) => $query->orderBy('created_at', 'desc'),
             'stock' => fn($query) => $query->orderBy('created_at', 'desc'),
         ])->find($productId);
-        if(null === $product) {
+        if (null === $product) {
             throw $this->createNotFoundException('Product not found');
         }
+        $priceList = $product->price()->pluck('price');
+        $stockList = $product->stock()->pluck('stock');
+        $priceDates = $product->price()->pluck('created_at')->map(fn($date) => $date->format('Y-m-d'))->toArray();
+        $stockDates = $product->stock()->pluck('created_at')->map(fn($date) => $date->format('Y-m-d'))->toArray();
 
-        $priceList = $product->price()->pluck('price')->implode(',');
-        $priceDates = $product->price()->pluck('created_at')->map(fn($date) => $date->format('Y-m-d'))->implode("','");
-        return $this->render('product.html.twig', ['product' => $product, 'price_list' => $priceList, 'price_dates' => $priceDates]);
+        return $this->render('product.html.twig', [
+            'product' => $product,
+            'price_list' => $this->prepareChartData($priceDates, $priceList),
+            'stock_list' => $this->prepareChartData($stockDates, $stockList),
+            'price_dates' => implode("','", $priceDates),
+        ]);
+    }
+
+    private function prepareChartData($set1, $set2): string
+    {
+        $data = [];
+        foreach ($set1 as $key => $value) {
+            $data[] = ['x' => $value, 'y' => $set2[$key]];
+        }
+        $stringData = json_encode($data);
+        return str_replace(['"x"', '"y"'], ['x', 'y'], $stringData);
     }
 }
diff --git a/templates/product.html.twig b/templates/product.html.twig
index 4d072b9..a267b4e 100644
--- a/templates/product.html.twig
+++ b/templates/product.html.twig
@@ -14,7 +14,7 @@
                 <nav aria-label="breadcrumb" style="--bs-breadcrumb-divider: '>';" >
                     <ol class="breadcrumb">
                         {% for category in product.categories %}
-                            <li class="breadcrumb-item" aria-current="page"><a class="breadcrumb-item text-decoration-none"  href="{{ path('app_category', {'category': category}) }}">{{ category }}</a></li></li>
+                            <li class="breadcrumb-item" aria-current="page"><a class="breadcrumb-item text-decoration-none"  href="{{ path('app_category', {'category': category}) }}">{{ category }}</a></li>
                         {%  endfor %}
                     </ol>
                 </nav>
@@ -55,26 +55,32 @@
     <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
 
     <script>
-        const ctx = document.getElementById('price');
+        const ctx = document.getElementById('price').getContext('2d');
 
         new Chart(ctx, {
             type: 'line',
             data: {
                 labels: ['{{ price_dates|raw }}'],
-                datasets: [{
-                    label: 'Price (PLN)',
-                    data: [{{ price_list }}],
-                    borderWidth: 1
-                }]
+                datasets: [
+                    {
+                        label: 'Price (PLN)',
+                        data: {{ price_list|raw }},
+                        yAxisID: 'yPrice',
+                        tension: 0.1,
+                        borderWidth: 1
+                    },
+                    {
+                        label: 'Stock (units)',
+                        data: {{ stock_list|raw }},
+                        yAxisID: 'yStock',
+                        tension: 0.1,
+                        borderWidth: 1
+                    }
+                ]
             },
             options: {
+                responsive: true,
                 animation: false,
-                plugins: {
-                    title: {
-                        display: true,
-                        text: 'Price in time'
-                    },
-                },
                 scales: {
                     x: {
                         title: {
@@ -82,13 +88,40 @@
                             text: 'Date'
                         }
                     },
-                    y: {
+                    yPrice: {
+                        type: 'linear',
+                        position: 'left',
                         beginAtZero: true,
                         title: {
                             display: true,
-                            text: 'Price'
+                            text: 'Price (PLN)'
+                        },
+                        grid: {
+                            drawOnChartArea: false
+                        }
+                    },
+                    yStock: {
+                        type: 'linear',
+                        position: 'right',
+                        beginAtZero: true,
+                        title: {
+                            display: true,
+                            text: 'Stock (units)'
+                        },
+                        grid: {
+                            drawOnChartArea: false
                         }
                     }
+                },
+                plugins: {
+                    legend: {
+                        display: true,
+                        position: 'top'
+                    },
+                    title: {
+                        display: true,
+                        text: 'Price and Stock in time'
+                    },
                 }
             }
         });