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I'm not sure about grape sap but I can tell you that birch sap is great and has no ill effects. You can collect it quickly and easily in the break of winter/early spring and it contains heterosides...
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I'm not sure about grape sap but I can tell you that birch sap is great and has no ill effects. You can collect it quickly and easily in the break of winter/early spring and it contains heterosides...