This site's own materials are direct: no subscription terms were confirmed on the page reviewed, and specifically recommend checking for one at checkout.
The order page itself doesn't confirm whether a recurring subscription option exists or is pre-selected — a real gap worth resolving at the actual checkout screen rather than assuming a one-time purchase.
Read the checkout screen carefully for any subscription checkbox before submitting payment, and confirm in writing with support if the terms aren't clear.
Get the ingredient list and guarantee terms confirmed in writing first.
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