Add Woocommerce Tab

<?php

// 1) Add woocommerce tab
add_filter( 'woocommerce_product_tabs', 'woo_nutrition_tab' );

function woo_nutrition_tab( $tabs ) {

    // Adds the new tab
    $tabs['nutrition_tab'] = array(
        'title'     => __( 'Nutrition Tab', 'woonutrition' ),
        'priority'  => 50,
        'callback'  => 'woo_nutrition_tab_content'
    );

    return $tabs;
}

// 2) Add woocommerce Nutrition Tab Content
function woo_nutrition_tab_content() {
    return '<div class="my-tab">My Tab Content</div>';
}