If you've selected one-time purchase, you won't be "locked" in to a monthly subscription. Rest assured that you don't need to commit to a monthly subscription unless you choose to. There are no recurring or hidden charges at all.
For customers who are interested in getting onto a subscription plan, so you don't have to keep re-ordering monthly, please select the subscription option on the product page. On the cart and checkout pages, you will see a description like "Deliver every month" for that product.
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