diff --git a/apps/frontend-mobile/app/(tabs)/map.tsx b/apps/frontend-mobile/app/(tabs)/map.tsx
index a9d783d..6e0d523 100644
--- a/apps/frontend-mobile/app/(tabs)/map.tsx
+++ b/apps/frontend-mobile/app/(tabs)/map.tsx
@@ -7,10 +7,12 @@ import { LoadingSpinner } from '../../components/LoadingSpinner';
 import { useThemeContext } from '../../components/ThemeProvider';
 import { spacing, borderRadius } from '../../constants/theme';
 import { Pharmacy } from '../../types';
+import { useTranslation } from '../../src/i18n';
 
 export default function MapScreen() {
   const router = useRouter();
   const { colors } = useThemeContext();
+  const { t } = useTranslation();
   const [pharmacies, setPharmacies] = useState<Pharmacy[]>([]);
   const [isLoading, setIsLoading] = useState(true);
   const [region, setRegion] = useState({
@@ -45,7 +47,7 @@ export default function MapScreen() {
   }, []);
 
   if (isLoading) {
-    return <LoadingSpinner message="Cargando farmacias..." />;
+    return <LoadingSpinner message={t('map.loadingPharmacies')} />;
   }
 
   return (
@@ -73,7 +75,7 @@ export default function MapScreen() {
       
       <View style={[styles.legend, { backgroundColor: colors.card }]}>
         <Text style={[styles.legendText, { color: colors.text }]}>
-          {pharmacies.length} farmacias en el mapa
+          {t('map.pharmaciesOnMap', { count: pharmacies.length })}
         </Text>
       </View>
     </View>
diff --git a/apps/frontend-mobile/app/product/[source]/[id].tsx b/apps/frontend-mobile/app/product/[source]/[id].tsx
index 21170ac..cedacc9 100644
--- a/apps/frontend-mobile/app/product/[source]/[id].tsx
+++ b/apps/frontend-mobile/app/product/[source]/[id].tsx
@@ -1,7 +1,10 @@
 import React, { useEffect, useState } from 'react';
-import { View, Text, ScrollView, StyleSheet, Image, ActivityIndicator } from 'react-native';
+import { View, Text, ScrollView, StyleSheet, Image, TouchableOpacity } from 'react-native';
 import { useLocalSearchParams } from 'expo-router';
+import { Ionicons } from '@expo/vector-icons';
 import { getProduct, Product } from '../../../services/products';
+import { subscribeToMedicine, unsubscribeFromMedicine } from '../../../services/notifications';
+import { useAuth } from '../../../hooks/useAuth';
 import { LoadingSpinner } from '../../../components/LoadingSpinner';
 import { useThemeContext } from '../../../components/ThemeProvider';
 import { spacing, borderRadius } from '../../../constants/theme';
@@ -11,9 +14,12 @@ export default function ProductDetailScreen() {
   const { source, id } = useLocalSearchParams<{ source: string; id: string }>();
   const { colors } = useThemeContext();
   const { t } = useTranslation();
+  const { isAuthenticated } = useAuth();
   const [product, setProduct] = useState<Product | null>(null);
   const [isLoading, setIsLoading] = useState(true);
   const [error, setError] = useState(false);
+  const [isSubscribed, setIsSubscribed] = useState(false);
+  const [togglingSub, setTogglingSub] = useState(false);
 
   useEffect(() => {
     if (!source || !id) return;
@@ -36,6 +42,25 @@ export default function ProductDetailScreen() {
     fetchProduct();
   }, [source, id]);
 
+  const handleToggleSubscription = async () => {
+    if (!isAuthenticated || !id) return;
+    setTogglingSub(true);
+    const productId = product?._id || product?.id || id;
+    try {
+      if (isSubscribed) {
+        await unsubscribeFromMedicine(productId);
+        setIsSubscribed(false);
+      } else {
+        await subscribeToMedicine(productId, product?.name || null);
+        setIsSubscribed(true);
+      }
+    } catch {
+      // silently fail
+    } finally {
+      setTogglingSub(false);
+    }
+  };
+
   if (isLoading) {
     return <LoadingSpinner message={t('product.loading')} />;
   }
@@ -63,8 +88,23 @@ export default function ProductDetailScreen() {
       <View style={[styles.header, { backgroundColor: colors.card }]}>
         <View style={styles.nameRow}>
           <Text style={[styles.name, { color: colors.text }]}>{product.name}</Text>
-          <View style={[styles.badge, { backgroundColor: isCima ? '#2b5bb5' : '#4caf50' }]}>
-            <Text style={styles.badgeText}>{isCima ? 'CIMA' : t('product.parapharmacy')}</Text>
+          <View style={styles.headerRight}>
+            <View style={[styles.badge, { backgroundColor: isCima ? '#2b5bb5' : '#4caf50' }]}>
+              <Text style={styles.badgeText}>{isCima ? 'CIMA' : t('product.parapharmacy')}</Text>
+            </View>
+            {isAuthenticated && (
+              <TouchableOpacity
+                style={[styles.bellButton, { backgroundColor: isSubscribed ? colors.primary : colors.surfaceVariant }]}
+                onPress={handleToggleSubscription}
+                disabled={togglingSub}
+              >
+                <Ionicons
+                  name={isSubscribed ? 'notifications' : 'notifications-outline'}
+                  size={20}
+                  color={isSubscribed ? '#fff' : colors.textSecondary}
+                />
+              </TouchableOpacity>
+            )}
           </View>
         </View>
         {product.brand ? (
@@ -171,6 +211,18 @@ const styles = StyleSheet.create({
     fontSize: 22,
     fontWeight: 'bold',
   },
+  headerRight: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+  },
+  bellButton: {
+    width: 36,
+    height: 36,
+    borderRadius: 18,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
   badge: {
     paddingHorizontal: spacing.sm,
     paddingVertical: spacing.xs,
diff --git a/apps/frontend-mobile/src/i18n/locales/ca.js b/apps/frontend-mobile/src/i18n/locales/ca.js
index 8d8c690..72ba31f 100644
--- a/apps/frontend-mobile/src/i18n/locales/ca.js
+++ b/apps/frontend-mobile/src/i18n/locales/ca.js
@@ -28,6 +28,10 @@ const ca = {
   'search.parapharmacy': 'Parafarmàcia',
   'search.error': 'Error en cercar medicaments',
 
+  // Map
+  'map.loadingPharmacies': 'Carregant farmàcies...',
+  'map.pharmaciesOnMap': '{{count}} farmàcies al mapa',
+
   // Login
   'login.tab.login': 'Iniciar Sessió',
   'login.tab.register': 'Crear Compte',
@@ -210,6 +214,9 @@ const ca = {
   'product.brand': 'Marca',
   'product.source': 'Font',
   'product.images': 'Imatges',
+  'product.availableInPharmacies': 'Disponible a {{count}} farmàcia/es',
+  'product.notifyWhenAvailable': 'Notificar-me quan hi hagi estoc',
+  'product.notificationsActive': 'Notificacions actives',
 
   // Components
   'medicineCard.noPrice': 'Sense preu',
diff --git a/apps/frontend-mobile/src/i18n/locales/es.js b/apps/frontend-mobile/src/i18n/locales/es.js
index 7157343..36fc34f 100644
--- a/apps/frontend-mobile/src/i18n/locales/es.js
+++ b/apps/frontend-mobile/src/i18n/locales/es.js
@@ -56,6 +56,10 @@ const es = {
   'search.parapharmacy': 'Parafarmacia',
   'search.error': 'Error al buscar medicamentos',
 
+  // Map
+  'map.loadingPharmacies': 'Cargando farmacias...',
+  'map.pharmaciesOnMap': '{{count}} farmacias en el mapa',
+
   // Scanner
   'scanner.title': 'Escanear TSI',
   'scanner.description': 'Escanea el código de barras de tu tarjeta sanitaria para encontrar tus medicamentos',
@@ -210,6 +214,9 @@ const es = {
   'product.brand': 'Marca',
   'product.source': 'Fuente',
   'product.images': 'Imágenes',
+  'product.availableInPharmacies': 'Disponible en {{count}} farmacia(s)',
+  'product.notifyWhenAvailable': 'Notificarme cuando haya stock',
+  'product.notificationsActive': 'Notificaciones activas',
 
   // Components
   'medicineCard.noPrice': 'Sin precio',
diff --git a/apps/frontend/src/i18n/locales/ca.js b/apps/frontend/src/i18n/locales/ca.js
index 9e01b22..d092d6d 100644
--- a/apps/frontend/src/i18n/locales/ca.js
+++ b/apps/frontend/src/i18n/locales/ca.js
@@ -81,6 +81,32 @@ const ca = {
   'product.dosage': 'Dosificació:',
   'product.viewDetails': 'Veure detalls →',
 
+  // ProductView (detail)
+  'productView.loading': 'Carregant...',
+  'productView.back': 'Tornar',
+  'productView.notFound': 'Producte no trobat',
+  'productView.parapharmacy': 'Parafarmàcia',
+  'productView.activeIngredient': 'Principi actiu',
+  'productView.dosage': 'Dosificació',
+  'productView.form': 'Forma farmacèutica',
+  'productView.prescription': 'Prescripció',
+  'productView.commercialized': 'Comercialitzat',
+  'productView.yes': 'Sí',
+  'productView.no': 'No',
+  'productView.price': 'Preu',
+  'productView.previousPrice': 'Preu anterior',
+  'productView.category': 'Categoria',
+  'productView.brand': 'Marca',
+  'productView.source': 'Font',
+  'productView.loadingPharmacies': 'Carregant farmàcies...',
+  'productView.availableInPharmacies': 'Disponible a {{count}} farmàcia/es',
+  'productView.locating': '📍 Localitzant…',
+  'productView.sortedByDistance': '📍 Ordenat per distància · Restablir',
+  'productView.sortByDistance': '📍 Ordenar per distància',
+  'productView.usingLocation': 'Usant la vostra ubicació',
+  'productView.retry': 'Tornar a provar',
+  'productView.productNotFound': 'Producte no trobat',
+
   // LoginModal
   'login.login': 'Iniciar sessió',
   'login.register': 'Crear compte',
diff --git a/apps/frontend/src/i18n/locales/es.js b/apps/frontend/src/i18n/locales/es.js
index 0015425..e683a57 100644
--- a/apps/frontend/src/i18n/locales/es.js
+++ b/apps/frontend/src/i18n/locales/es.js
@@ -81,6 +81,32 @@ const es = {
   'product.dosage': 'Dosis:',
   'product.viewDetails': 'Ver detalles →',
 
+  // ProductView (detail)
+  'productView.loading': 'Cargando...',
+  'productView.back': 'Volver',
+  'productView.notFound': 'Producto no encontrado',
+  'productView.parapharmacy': 'Parafarmacia',
+  'productView.activeIngredient': 'Principio activo',
+  'productView.dosage': 'Dosis',
+  'productView.form': 'Forma farmacéutica',
+  'productView.prescription': 'Prescripción',
+  'productView.commercialized': 'Comercializado',
+  'productView.yes': 'Sí',
+  'productView.no': 'No',
+  'productView.price': 'Precio',
+  'productView.previousPrice': 'Precio anterior',
+  'productView.category': 'Categoría',
+  'productView.brand': 'Marca',
+  'productView.source': 'Fuente',
+  'productView.loadingPharmacies': 'Cargando farmacias...',
+  'productView.availableInPharmacies': 'Disponible en {{count}} farmacia(s)',
+  'productView.locating': '📍 Localizando…',
+  'productView.sortedByDistance': '📍 Ordenado por distancia · Reset',
+  'productView.sortByDistance': '📍 Ordenar por distancia',
+  'productView.usingLocation': 'Usando tu ubicación',
+  'productView.retry': 'Reintentar',
+  'productView.productNotFound': 'Producto no encontrado',
+
   // LoginModal
   'login.login': 'Iniciar sesión',
   'login.register': 'Crear cuenta',
diff --git a/apps/frontend/src/views/ProductView.jsx b/apps/frontend/src/views/ProductView.jsx
index c6493ad..cc4553b 100644
--- a/apps/frontend/src/views/ProductView.jsx
+++ b/apps/frontend/src/views/ProductView.jsx
@@ -2,9 +2,11 @@ import React, { useState, useEffect, useMemo } from 'react';
 import PharmacyMap from '../components/PharmacyMap';
 import PharmacyList from '../components/PharmacyList';
 import { haversineKm, getUserPosition, hasCachedPosition } from '../utils/geo';
+import { useTranslation } from '../i18n';
 import './ProductView.css';
 
 export default function ProductView({ source, id, onBack }) {
+  const { t } = useTranslation();
   const [product, setProduct] = useState(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(null);
@@ -43,11 +45,11 @@ export default function ProductView({ source, id, onBack }) {
       setPositionSource('browser');
       setSortByDistance(true);
     } catch (err) {
-      let msg = 'No se pudo obtener tu ubicación';
+      let msg = t('search.locationError');
       if (err && typeof err.code === 'number') {
-        if (err.code === 1) msg = 'Permiso de ubicación denegado.';
-        else if (err.code === 2) msg = 'Ubicación no disponible.';
-        else if (err.code === 3) msg = 'La ubicación tardó demasiado.';
+        if (err.code === 1) msg = t('search.locationDenied');
+        else if (err.code === 2) msg = t('search.locationUnavailable');
+        else if (err.code === 3) msg = t('search.locationTimeout');
       }
       setLocationError(msg);
     } finally {
@@ -72,7 +74,7 @@ export default function ProductView({ source, id, onBack }) {
 
       const response = await fetch(apiUrl);
       if (!response.ok) {
-        throw new Error('Producto no encontrado');
+        throw new Error(t('productView.productNotFound'));
       }
       const data = await response.json();
       setProduct(data);
@@ -102,7 +104,7 @@ export default function ProductView({ source, id, onBack }) {
   if (loading) {
     return (
       <div className="product-view">
-        <div className="product-loading">Cargando...</div>
+        <div className="product-loading">{t('productView.loading')}</div>
       </div>
     );
   }
@@ -114,7 +116,7 @@ export default function ProductView({ source, id, onBack }) {
           <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
             <path d="M19 12H5M12 19l-7-7 7-7" />
           </svg>
-          Volver
+          {t('productView.back')}
         </button>
         <div className="product-error">{error}</div>
       </div>
@@ -126,7 +128,7 @@ export default function ProductView({ source, id, onBack }) {
   const isCima = product.source === 'cima';
   const isParapharmacy = product.source !== 'cima';
   const sourceColor = isCima ? '#2563eb' : '#16a34a';
-  const sourceLabel = isCima ? 'CIMA' : 'Parafarmacia';
+  const sourceLabel = isCima ? 'CIMA' : t('productView.parapharmacy');
 
   return (
     <div className="product-view">
@@ -134,7 +136,7 @@ export default function ProductView({ source, id, onBack }) {
         <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
           <path d="M19 12H5M12 19l-7-7 7-7" />
         </svg>
-        Volver
+        {t('productView.back')}
       </button>
 
       <div className="product-header">
@@ -153,37 +155,37 @@ export default function ProductView({ source, id, onBack }) {
         {isCima ? (
           <>
             {product.active_ingredient && (
-              <DetailRow label="Principio activo" value={product.active_ingredient} />
+              <DetailRow label={t('productView.activeIngredient')} value={product.active_ingredient} />
             )}
             {product.dosage && (
-              <DetailRow label="Dosis" value={product.dosage} />
+              <DetailRow label={t('productView.dosage')} value={product.dosage} />
             )}
             {product.form && (
-              <DetailRow label="Forma farmacéutica" value={product.form} />
+              <DetailRow label={t('productView.form')} value={product.form} />
             )}
             {product.prescription && (
-              <DetailRow label="Prescripción" value={product.prescription} />
+              <DetailRow label={t('productView.prescription')} value={product.prescription} />
             )}
             {product.commercialized !== undefined && (
-              <DetailRow label="Comercializado" value={product.commercialized ? 'Sí' : 'No'} />
+              <DetailRow label={t('productView.commercialized')} value={product.commercialized ? t('productView.yes') : t('productView.no')} />
             )}
           </>
         ) : (
           <>
             {product.price && (
-              <DetailRow label="Precio" value={`${product.price} €`} />
+              <DetailRow label={t('productView.price')} value={`${product.price} €`} />
             )}
             {product.original_price && product.original_price > product.price && (
-              <DetailRow label="Precio anterior" value={`${product.original_price} €`} />
+              <DetailRow label={t('productView.previousPrice')} value={`${product.original_price} €`} />
             )}
             {product.category && (
-              <DetailRow label="Categoría" value={product.category} />
+              <DetailRow label={t('productView.category')} value={product.category} />
             )}
             {product.brand && (
-              <DetailRow label="Marca" value={product.brand} />
+              <DetailRow label={t('productView.brand')} value={product.brand} />
             )}
             {product.source_url && (
-              <DetailRow label="Fuente" value={product.source} />
+              <DetailRow label={t('productView.source')} value={product.source} />
             )}
           </>
         )}
@@ -191,11 +193,11 @@ export default function ProductView({ source, id, onBack }) {
 
       <div className="product-pharmacies">
         {loadingPharmacies ? (
-          <div className="pharmacies-loading">Cargando farmacias...</div>
+          <div className="pharmacies-loading">{t('productView.loadingPharmacies')}</div>
         ) : pharmacies.length > 0 ? (
           <>
             <h3 className="pharmacies-title">
-              Disponible en {pharmacies.length} {pharmacies.length === 1 ? 'farmacia' : 'farmacias'}
+              {t('productView.availableInPharmacies', { count: pharmacies.length })}
             </h3>
 
             <div className="pharmacy-controls">
@@ -205,19 +207,19 @@ export default function ProductView({ source, id, onBack }) {
                 disabled={locating}
               >
                 {locating
-                  ? '📍 Localizando…'
+                  ? t('productView.locating')
                   : sortByDistance
-                    ? '📍 Ordenado por distancia · Reset'
-                    : '📍 Ordenar por distancia'}
+                    ? t('productView.sortedByDistance')
+                    : t('productView.sortByDistance')}
               </button>
               {sortByDistance && positionSource && (
-                <span className="location-source">Usando tu ubicación</span>
+                <span className="location-source">{t('productView.usingLocation')}</span>
               )}
               {locationError && (
                 <span className="location-error">
                   {locationError}
                   <button className="retry-location-btn" onClick={handleSortByDistance}>
-                    Reintentar
+                    {t('productView.retry')}
                   </button>
                 </span>
               )}